Tuesday, August 07, 2018

My Inner Space Child

Not very deep inside me is a still-space-obsessed Inner Child who thinks space flight is the coolest thing ever. As a kid in the sixties, I was super-excited to follow the Mercury and Gemini and Apollo missions as they happened, and I covered the walls of my bedroom with the space posters NASA would send me by the ton whenever I wrote to ask. Space was real then. Apollo 8 orbited the moon in 1968, and in that same White Album year, 2001: A Space Odyssey convinced me that space ships full of people would be tooling around the solar system before I was even 50 years old. I wanted to go!

Of course it didn’t quite pan out that way. The moon landings ended in 1972 and I never got to be a test pilot and an astronaut which was my plan since I was ten. We did have a cool space shuttle for a while, and astronauts on the International Space Station (ISS) still circle the globe every 90 minutes. We’ve also sent a bunch of amazing robots to tool around the solar system on our behalf. This isn’t as exciting as the 2001 movie, but I like all of that stuff too.

Even though my obsession is usually turned down to a low simmer, every once in a while something will trigger my Inner Space Child and I will get super-excited again. Sometimes it’s a book, often by Kim Stanley Robinson. Sometimes it’s a movie like The Martian in 2015. But most often it’s something Elon Musk says or does. NASA is still doing lots of important work but it seems that SpaceX gets all the glory. That’s probably because of Elon Musk’s hyperactive Inner Child, and because Elon (yes, I call him Elon) has huge ambition, a huge fortune, and a huge ego, so he can say, “wouldn’t be cool if we could build a rocket that’s bigger than a football field that could fly dozens of people to Mars” and the SpaceX engineers will all say “I’m on it.” And they are. That’s the already-in-work “BFR” which stands for “Big Falcon Rocket” (sure it does). I’ve also seen it called BFS for Big Falcon Ship, and if it really happens as planned, it will certainly be the first true space SHIP, huge and fully re-usable. Elon says that “short test flights” will begin in 2019. That probably means 2020 or 2021, but still. They are seriously building a space ship to colonize Mars (it will do lots of other stuff too).

This week I got excited when I learned about a new SpaceX add-on for the Orbiter 2016 space flight simulator. Orbiter is a free space-flight simulator that runs on a PC. It has accurate physics and beautiful graphics and it is a Space Nerd Inner Child’s dream come true. I spent about a year obsessed with it when I first discovered it in 2005. I even wrote a book about it, Go Play In Space, which teaches you how to do just that.  I still fire up Orbiter on my PC every now and then, usually when I hear about some new features or some cool new add-on developed by someone in the Orbiter community.

The new add-on is a model of the SpaceX Crew Dragon spacecraft that is set to start carrying astronauts for NASA in 2019 (an “add-on” is a user-developed set of 3D models and computer code that work within Orbiter to simulate a specific spacecraft). This one was the latest work of “BrianJ,” a talented add-on creator who has also made an add-on of the SpaceX Falcon 9 rocket needed to carry the Crew Dragon or other payloads into virtual orbit. In late 2017 another prolific add-on maker (“francisdrake”) created a model of the SpaceX BFR.

To capture the picture above, I created a scenario in Orbiter 2016 with the Crew Dragon docked to the “top” of the BFR in low Mars orbit (BFR's "wings" are actually solar panel arrays that deploy like Japanese fans). For scale, the SpaceX Crew Dragon with its “trunk” is about 27 feet or 8 meters long, taller than a two-story house. So you can see that the BFR is indeed a Big something Rocket. Search for "BFR size comparison" and you will find many illustrations of its incredible size. Also check out this speculative but suggestive cutaway diagram of the interior of the BFR's second stage (the part that will go to Mars). 

But Orbiter add-ons are more than just pictures or even 3D models. They are working models of the spacecraft, so they can be launched, flown to orbit (or to Mars), maneuvered, entered in the atmosphere, and landed. The Falcon 9 first stage and the BFR are “tail sitters” so they land with rockets blazing. I haven’t tried this yet with the BFR, but I have flown BrianJ’s Falcon 9 and Falcon Heavy a few times (the built-in autopilot makes this rather easy). If you’d like to see it without bothering to install Orbiter, you can watch a video like this one. It's really amazing to see the first stage boosters turn around and fly themselves back to their landing pads. 

Is it weird to be so obsessed, still space-crazy after all these years? Maybe. But I prefer to think that I’m nurturing a sense of wonder that never quite left me. Or something like that. 

This picture shows BrianJ's SpaceX Crew Dragon orbiting the moon in Orbiter 2016.

Sunday, June 03, 2018

Center Of It All

I have a new album! Center Of It All is available for download on CD Baby, and actual CD's will also be available there within a couple of weeks. It is also available on Apple Music, Amazon Music, Spotify, YouTube and other download and streaming sites.

I'm really pleased with how the album came out. I've been working on this project on and off for six years, since my last album Look At You in 2012. This is the fourth album produced by my friend Roger Lavallee, and as usual, Roger also came up with great arrangements, played most of the guitars, programmed the drums, and accomplished what still blows my mind every time I hear it -- he made it sound like a record! I also want to thank my friend Craig Collins for designing the cover graphics. He did a beautiful job of integrating my interests in music and space and in visualizing the idea of the "center of it all." Thanks also to my two co-writers (Rob Simbeck on "Center Of It All" and "Saving the World" and my brother Doug Irving on "Foggy Morning London Town").

Here are the album notes I wrote for the album page on CD Baby:

Writing and recording songs can give you a rich fantasy life. Like when you watch an episode of "The Americans" (great show) and out pops the song "Rough Days." Or when you imagine being so down and out that you wish someone would airlift you away and voila, "Angels Are Hiding." Think you're tired? Try flapping your wings 1500 times a minute like the characters in "Hummingbird." How about a pep talk from a quasi-Rastafarian? That's "Hey O Way O." An early morning stroll down Abbey Road? "Foggy Morning London Town." A helicopter getaway? "When Charlie Went AWOL." There's a song just called "Who?" What's that all about? Or who?

It's not all crazy talk. There's some of the usual sensitive guy "what's it all about" stuff too, like "In the Name of Love," "No Second Chances," and even "Saving the World." "Center Of It All" was inspired by memories of my Mom who passed away just recently - she really was the center of it all for me and my family.

There's a lot of rock, a ton of harmonies, a bit of folk and country, and just a dash of jazz. An album 6 years in the making with twelve very different and dare I say rather good songs (yes, I dare say). And I must ALSO say that if you like cool guitar solos, my producer, friend, and Local Guitar God Roger Lavallee has really outdone himself on this project. Smoking.

It's a good album. You'll like it. Trust me. Why would I lie?

Tuesday, April 24, 2018

What If Space Really Sucks?

I read an interesting essay on The Space Review by Dwayne Day, titled “Mars ain’t the kind of place to raise your kids,” quoting Bernie Taupin in Elton John's song “Rocketman.” That 2017 essay was inspired by the SF TV series The Expanse, which is now in its third season (I bought the first season and watched a couple of episodes on Amazon Video -- I liked it but never returned to it since it’s not my wife’s thing and I have so many other time sinks). He doesn’t talk too much about The Expanse except to describe it as “gritty” and to say that it depicts a settled solar system a few hundred years in the future, and guess what? There’s politics and war and crime and inequality and oppression of asteroid colonists by Earth and Mars people, and resentment of Earth by Martians who are struggling to make their planet livable, and not just a place defined by its independence of Earth. There are many other problems too, e.g., agriculture collapses on Ganymede because the engineered environment is not as robust as natural environments of Earth. This is something that Kim Stanley Robinson addresses in his colony-starship novel Aurora  which I read and wrote about back in 2015 and found really fascinating (as I do most of KSR's books).

I guess the bottom line is that people are people, and that moving to Mars or a space colony or anywhere is no magic bullet. If there are multiple people anywhere, there will be conflicting needs, priorities, goals, etc. that will need to be managed. Even if you build a seemingly robust, prosperous, and somewhat fair and democratic society like the United States, it won’t be prosperous and fair to all its people, and a scam artist like Donald Trump can come along and try to ruin it for everyone except himself and a few of his wealthy supporters and Russian friends. That’s our now. I don’t think Trump will ultimately succeed in ruining the American Experiment, but he might (or he might drag us into wars that will screw up everything for everyone).

To me, space is not a religion or a utopia or even a next frontier that is needed to inspire humanity to be better. I think it is a source of materials, energy, and yes, space for future populations to exploit, in ways that at least have the potential (in the very long run) to relieve pressure on Earth-bound ecosystems and societies. And for now at least, exploiting those resources will not displace or destroy anyone else as the Europeans did when they invaded the “New World.” I think the profit motive will play a key part in having a reason and the means to get more people in space, even if it’s not the only reason, with Elon Musk and SpaceX serving as Exhibit A for this approach. Having a long-run backup plan for humanity doesn’t seem crazy to me – as long as it isn’t coupled with the idea that we can just abandon this planet. Earth is really perfect for us, because we co-evolved with it. So as KSR and many others suggest, we have to make this planet work. That doesn’t preclude also using asteroids, the Moon, and other planets for their living space and resources. But we shouldn't expect them to be perfect societies or utopias. They will be imperfect, human creations, just like everything else humans have created (with the exception of Mozart's music). 

But I also think that AI is going to have a very big part to play in space and in every aspect of life going forward, which may be bad news for old fashioned flesh-and-blood humans like us. If engineered “mind children” are the ones that reach the planets first... well, I don’t know what I think about it. For sure they won’t need life support, just energy sources. And maybe they won’t need meat machines like their parents to slow them down. I hope they still like us and remember to send us a postcard now and then.

Friday, March 09, 2018

Finding My Muse (Score)

It's funny how things happen. A few months ago, I switched from Sonar to Studio One as my main music recording software. I got a special Black Friday deal from Presonus. I really like Studio One and I've been writing and recording songs with it, so I'm happy, right? Then in January Presonus sent me a special offer on another piece of music software for Windows, Notion 6. It's a music notation and composition program which also interfaces with Studio One. Of course I didn't really need it but I'm always musically curious, so I bought it and started to fool around with writing little instrumental pieces to learn the interface. I learned that they have an iPad version, even cheaper ($15) and file compatible with Notion 6. Cool. I can write music anywhere, even on my iPhone.

So now I'm writing simple stuff and searching for scores to learn from. I found a site called musescore.com and learned that this is an active community of composers and classical music enthusiasts of all levels. In addition to many classic scores, I quickly discovered several rather impressive amateur composers to follow. There is also a free, open source composition and notation program called MuseScore 2 which I downloaded. It turns out to be better on Windows than Notion 6 in many respects, not least of which is the fact that you can upload your scores to musescore.com to share and discuss them with others (you can also import/export MusicXML, MIDI, and other file formats to transfer scores between different notation programs, including Notion). .

What's funny about this is that I can barely read music. Actually I know the notes and quite a bit of music theory, though I don't read and write notation fluently. I rely mostly on my ears. But with programs like Notion and MuseScore, this doesn't matter too much. Much like writing songs, I can try things, hear them instantly, and fix or improve them interactively. It's fun and educational. I've always regretted not being stronger with theory and notation, and this gives me a reason and a means to improve. When I told my friend Peter Inglis that I was embracing notation, he said "finally!" He's been urging me to learn to read and create musical "source code" for years! So I finally am. I've already noticed improvement in my ability to follow and understand scores. And write some too.

My early exercises are mostly brief pieces in string quartet form just because this gives you a small number of voices to explore. One I especially like was inspired by the fictional oboe player Hailey Rutledge on the Amazon Prime TV show "Mozart in the Jungle." It's called "For Hai Lai" (watch the show).

I am FlyingSinger at musescore.com if you want to check out any of my scores -- or skip those silly things and go right for compositions by those who really know what they're doing.

Saturday, December 30, 2017

Hey O Way O

Do you remember the children's book Alexander and the Terrible, Horrible, No Good, Very Bad Day? Just substitute "year" and that pretty much sums up 2017. I don't want to talk about it.

My readership (both of you) may have noticed that I haven't written a blog post since April 2017. Yeah, I have pretty much stopped blogging in favor of writing in my journal. I use an app called Day One, and if you have any interest in keeping a journal on an iPhone, iPad, or Mac, I can heartily recommend it. I started in July 2014 and now, 1,266 days and 3,055 journal entries later, I'm still writing two or three entries a day. I guess I still like to write.

And I still like to make music, even when things are crappy. I've written maybe a dozen songs in 2017 and recorded a few with my friend and producer Roger Lavallee. Roger and I have been working on music together since 2002 and he is totally amazing as a guitarist, drum programmer, arranger, producer, and engineer. I decided to share our latest "nearly complete" song on SoundCloud today. It's part of a long-rumored 2015, oops, 2016, oops, 2017, oops, 2018 album project.

This song is a quirky sort of pep talk to a friend. Or something. It's called "Hey O Way O" because, why not? I say that a lot in the song. The lyrics are on the SoundCloud page if you're interested. This happens to be the first song we completed in Studio One 3 after using Cakewalk Sonar for many years (Roger is a ProTools guy but he adapts amazingly well to new recording software). The goal is to make music, whatever the tools, but Studio One (S1) has a clean and modern interface that really makes it easy to learn and use. I jumped ship when I heard that parent company Gibson is stopping development of Cakewalk products. A half-price Black Friday sale also helped ($200 for the Professional version). It's nice that most of the plugins I have for Sonar work with S1 too.

Let's all hope that 2018 will be a better year for all of us. Cheers!

Thursday, April 27, 2017

Conscious AI as a Feature, Not a Bug

I really like the SF show Humans and its depiction of an alternate present-day UK where in addition to iPhones and super-fast internet service, humanoid “synths” have come into widespread use as servants, workers, caretakers, and companions. The basic premise is that while these robots are sufficiently human-like to engage in conversation and even sex (complete with body warmth and fluids, apparently), they are “just machines,” and people are not supposed to consider them as “persons,” though many certainly develop relationships with them, as humans do even with dogs and cats. And as with pets (and people), some humans will abuse their synths.

The big plot driver in this show (spoiler alert!) is that some of the synths have secretly been “upgraded” to possess consciousness and emotions, and when some far-fetched circumstances lead to this upgrade being pushed over the network to all synths, we have the makings of an uprising. That’s where they leave us hanging at the end of season 2, with thousands of synths “waking up” and abandoning their dreary posts as gardeners or whatever. There's a lot to swallow to really enjoy this show, but the writing and characters are good, and they manage to earn my suspension of disbelief most of the time. I'm looking forward to season 3 (I hope it's renewed). 

What always bothered me about the show is that despite their stilted speech and claims to not understand many “human things,” normal synths function at such a high level that it’s hard to imagine that they are not self-aware above and beyond whatever technical self-diagnostic systems they may have (so they can know when to recharge their batteries and recognize when another synth is not broadcasting as they apparently are supposed to do). Their ability to converse smoothly, navigate messy home and family environments, to even read human emotional states and anticipate needs, and to explain why they do things (when asked)… these suggest they are much more than “mere machines.” But would this mean they are “conscious?” What does that even mean?

This Nautilus article by a Japanese neuroscientist and AI researcher delves into this: “We Need Conscious Robots: How introspection and imagination make robots better” by Ryota Kanai.  He emphasizes that something like consciousness or at least self-awareness will be needed to allow AI systems to explain their “reasoning,” decisions, and actions to people, so people can feel more confident in and safer with these entities. But he suggests a more immediate need for such awareness – to allow for simple and common delays in their interactions with people and objects caused by distractions or other factors. Sometimes I forget why I walked down to the basement or that I put my coffee cup in the microwave, but most of the time, I “know what I’m doing” at least over a brief time period. This seemingly simple knowledge is connected to consciousness. As Kanai writes:
In fact, even our sensation of the present moment is a construct of the conscious mind. We see evidence for this in various experiments and case studies. Patients with agnosia who have damage to object-recognition parts of the visual cortex can’t name an object they see, but can grab it. If given an envelope, they know to orient their hand to insert it through a mail slot. But patients cannot perform the reaching task if experimenters introduce a time delay between showing the object and cuing the test subject to reach for it. Evidently, consciousness is related not to sophisticated information processing per se; as long as a stimulus immediately triggers an action, we don’t need consciousness. It comes into play when we need to maintain sensory information over a few seconds.
 He also talks about the need for some level of “desire” or curiosity in robots or other AI systems to avoid humans needing to spell out every detail of the simplest request. One aspect of this is “counterfactual information generation” (i.e., thinking about or modeling past or future situations, not only the here-and-now). Kanai writes, “We call it ‘counterfactual’ because it involves memory of the past or predictions for unexecuted future actions, as opposed to what is happening in the external world. And we call it ‘generation’ because it is not merely the processing of information, but an active process of hypothesis creation and testing.” He gives an example of one of their test AI agents learning to drive around a simulated landscape and deciding that climbing a hill would be a useful problem to solve in order to drive the most efficient route (without being taught or specifically asked to do this, as would normally be needed).

In the context of my home, this makes me think about how our aging dog Gracie would always like to go upstairs to sleep in our bedroom during the day, but we keep the gate closed at the bottom to limit her stair-climbing due to her arthritis. She will sometimes push open a loosely-closed door but has never tried to pull open the loosely-closed baby gate (if she learned this, we would just have to keep the gate latched). If we had a Humans-type “synth” and I wanted it to go upstairs and get me my wallet, it would have to know that if the gate or bedroom door were closed, or if something on the stairs were blocking access, it should open the gate or door or move the object. That could be some simple logic programming I suppose (if door closed, open it, unless it's locked, or something), but the more human-friendly approach would be to remember and “want to” complete the goal, independently solving any minor sub-problems along the way.

Kanai writes in conclusion: 
If we consider introspection and imagination as two of the ingredients of consciousness, perhaps even the main ones, it is inevitable that we eventually conjure up a conscious AI, because those functions are so clearly useful to any machine. We want our machines to explain how and why they do what they do. Building those machines will exercise our own imagination. It will be the ultimate test of the counterfactual power of consciousness.
This makes sense to me. If we are to interact comfortably with future robots or other AI systems, it will be helpful if they can maintain a "mental model" of our household, workplace, or other relevant environments, not so they can feel good or bad about themselves, or fall in love or whatever, but because these are things we unconsciously expect in social interactions. Simpler systems or apps, even voice-driven ones like Siri and Amazon's Alexa, can get by with being strictly transactional, to tell me the weather or play me some Talking Heads music as soon as I ask. But conversation and predictability will be a lot smoother if these systems have at least some level of self- and other-awareness and some ability to learn how things work around here. We can decide later whether this is the same as what we call "consciousness," but it is certainly like it in some ways. As AI systems improve, they will behave more and more like conscious entities, whether they are or not.

Then of course we can have that long-anticipated war between the humans and the machines. May the best entity win. But would you mind getting me my slippers first? 


Nautilus is a great web-based science magazine that features essays by various writers, often touching on the societal aspects of science and technology. There's a theme for each month's issue to which the essays are at least loosely tied. This month it's consciousness.

Friday, January 27, 2017

Nothing Is Unbelievable Now

The word “unbelievable” is obsolete now that Trump is president. Any horrible thing you can imagine someone in government doing or saying is believable now. Trump's appointments and actions seem calculated to hurt the most people possible, especially if they are brown, female, or immigrants. Some of this is ideological but most of it seems more like mean-spirited bullying, a Trump specialty. It doesn't seem that these actions actually HELP anyone, not even Trump's misguided yet hopeful supporters, but he's fulfilling his wild campaign promises, so his fans are like, “hell yeah!” Many of Trump's actions will end up hurting his supporters much more than they will educated know-it-all liberals like me.

But to see this requires accepting facts and sometimes complicated reasoning. Take for example building a wall with Mexico and (maybe) imposing 20% import tariffs on goods from Mexico to “force them to pay for it.” This will raise prices on many goods for Americans (including vegetables and fruits) and probably cost jobs in industries that rely on imported parts. We could have a trade war. Americans will pay for the wall through higher prices and job losses. It will also damage the Mexican economy which will likely increase illegal immigration regardless of any wall.

As was the case during the campaign, there's such a flurry of batshit-crazy "alternative facts" coming out of Trump and his cronies that it's hard to keep it all in focus. And it's only been one week! This is all bad, but it's just the tip of the iceberg because he is also saying and doing scary things in the international arena, like saying again that we "should have kept the oil" in Iraq, and maybe we will get another chance. Statements like this are lighting up social media in the Arab world and putting at even greater risk the thousands of military personnel we still have in place helping our Iraqi allies to fight ISIS. And as Trump has been so fond of saying about others, there is clearly "something going on" with Russia to explain why he has criticized everyone from the US intelligence community to John Lewis to Meryl Streep -- but never Vladimir Putin.

Here are a few other examples just from today's NY Times.

Gail Collins suggests that Trump actually has no strong views on abortion and women's rights (or perhaps on anything but himself) but that he's just following Pence's toxic anti-woman agenda on this. He's a puppet for both Putin and Pence.


Nicholas Kristoff points out that the stupid lies about inauguration crowd sizes and nonexistent electoral fraud are acting as a smokescreen for real damage caused by early actions like the abortion “gag rule” that blocks US foreign aid to any care-providing organization that even discusses abortion. This goes farther than gag rules from earlier presidents in that it will apply to all health services, including for example efforts to combat the Zika virus. Direct US funding of abortions is already banned, but this expanded policy will kill poor women in places like Africa and lead to more abortions. But Pence and Trump won't see or care.


Charles Blow focuses on Trump's use of lies and criticism of the press to try to control all narratives, supplying “alternate facts” when the truth is too inconvenient, as it usually is. In addition to this, the Trump team is blocking US government agencies that deal with science from using social media and removing references to climate change from government websites. Charles Blow writes in part:

[Trump] is in fact having a running war with the truth itself.

Donald Trump is a proven liar. He lies often and effortlessly. He lies about the profound and the trivial. He lies to avoid guilt and invite glory. He lies when his pride is injured and when his pomposity is challenged.

Indeed, one of the greatest threats Trump poses is that he corrupts and corrodes the absoluteness of truth, facts and science.


Welcome to 1984.

The cartoon by Nomi Kane is from The Nib, a great political cartoon site:


Tuesday, January 24, 2017

Fermi Paradox Explained?

I’ve often thought that the whole “where are they?” question about SETI (i.e., the Fermi Paradox) is bogus, both because the universe is just so BIG, and because we still understand so little about it, even though we have learned in recent years that planets and even “Earth-like” planets seem to be quite common throughout the Galaxy. As smart as some of us may be, it seems likely that we are still as clueless about major chunks of physics as scientists in the 1800’s were about quantum mechanics and the scale of the universe. If there are wormholes or quantum foam or gravitational technologies we won't develop for another 200 years, there could be aliens popping in and out all the time, and we wouldn't even know what to look for. It would be like an airliner passing 37,000 feet above some remote tribe of people who have never encountered other humans or modern technology, as unlikely as that may be today.

Such advanced beings might find radio wave communication to be as quaint as rubbing sticks together as an energy technology. I’ve also read articles suggesting that we ourselves are probably approaching the end of our “radio age” due to fiber optics and other technologies. Though we still send out a lot of radio waves, they tend to be more directional (like radar, microwaves, etc.) or short range (cell phone towers, Wifi, Bluetooth, etc.). Maybe technical civilizations only use radio waves for a few years and any continued or specialized use eventually becomes very efficient with very little leakage to space.

Somehow I wandered over to Centauri Dreams, a blog that periodically blows my mind with advanced space exploration ideas. I found an article “CitizenSETI” about a couple of guys (Roger Guay and Scott Guerin) who decided to work out this Fermi thing. A key part is the lifetime of an IC (intelligent civilization), which really means the DETECTABLE lifetime. If that is very short (e.g., humans have been broadcasting for about 110 years and listening for only about 60 years), and if such civilizations are widely separated in time and space, you will have a big “synchronicity” problem – finding times and places where someone is broadcasting AND someone in range is listening.

Roger Guay created a simulation with LiveCode, a modernized version of my old, beloved HyperCard for the Mac (screen shot above). In his Advanced Civilization Detection (ACD) program, he can set various assumptions about the spacing, lifetime, and other factors and run this simulation at high speed. Under most reasonable assumptions it creates a sort of “firefly” effect with detectable IC’s flashing in and out of existence and only rarely being seen by other IC’s. If these assumptions and simulations are reasonable, IC’s could be plentiful and it might still take hundreds of years of observation to catch one of these “fireflies” before it flickers out.

I've been interested in this subject since I read Intelligent Life inthe Universe by Carl Sagan and Iosif Shlovsky back in 1974. This was a pretty early work on exobiology (or perhaps astrobiology), a field that still lacks data but provides an interesting framework for thinking about everything we know about ourselves. My guess is that unicellular life has probably evolved in many places but that the leaps to multicellular, intelligent, and technological stages are much rarer, though certainly possible (current sample size is N=1 if you give humanity the benefit of the doubt as an IC).

Based on this simulation work, we are not likely to expand that sample size anytime soon. Here is Roger Guay’s final paragraph on Centauri Dreams:

Conclusions? The ACD simulation dramatically demonstrates that there is indeed a synchronicity problem that automatically arises when ICs attempt to detect one another. And for reasonable (based on Earth’s specifications) Drake equation parameter selections, detection potentials are shown to be typically hundreds of years apart. In other words, we can expect to search for a few hundred years before finding another IC in our section of the galaxy. When you consider Occam’s razor, is not this synchronicity problem the most logical resolution to the Fermi Paradox?

Of course this is hardly the last word on the subject of the Fermi Paradox. In fact, while reading the blog posts that triggered this one, I discovered a recently updated book that goes into much greater depth, If the Universe IsTeeming with Aliens … WHERE IS EVERYBODY?: Seventy-Five Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life (2015) by Stephen Webb. I've read the Kindle sample and I may have to buy it despite my insane backlog of books already waiting to be read. Author Stephen Webb also has an interesting blog