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Quick, How Might the Alien Spacecraft Work?
How Stephen Wolfram helped with the theory of interstellar travel, communication with aliens and questions from the actors in “Arrival”, the movie.
Topics /
Science & Space
The most popular blog posts about science & space on Hacker News. 82 posts.
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What makes music sound “good?”
When listening to music, however, we are not just listening to a series of disconnected instants. Instead, the way things sound depends on the notes we have heard. In other words, we integrate over time . One of the most important functions of a musical scale is to limit the overall pitch content of what we're hearing…
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They knew it was round, damn it
Last week saw various reports about a rare stolen copy of a Columbus letter that had turned up in the Library of Congress and has now been restored to its Italian owners; a comparatively happy end …
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Shuffleboard at McMurdo
Somewhere below the Antarctic circle, I catch Tatiana, the waitress from the port side dining room, in a moment of leisure.
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Telomeres – Too much of a good thing?
One of the major themes in aging science of the last 15 years has been that there is natural variation in telomere length, and individuals with longer telomeres have lower disease risk and longer life expectancy than those with shorter telomeres.
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A small 2009 car demolishes a 1959 Chevy in a crash test [video]
In 2009, The Insurance Institute for Highway Safety conducted a crash test between a 1959 Chevrolet Bel Air and a 2009 Chevy Malibu. The video plainly shows how
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To approximate 52! by hand, compute 54! and divide by 3000
Some time ago I gave a talk in which I showed that something unexpected happened with a deck of playing cards. I had some volunteers try it, and while they did so I talked about just how many orderings there are for 52 cards. I computed (an approximation to) $52!$ (52 factorial) by hand. It's not so hard - you just…
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How to assign partial credit on an exam of true-false questions?
Note: the following is a record of some whimsical mathematical thoughts and computations I had after doing some grading. It is likely that the sort of problems discussed here are in fact well studi…
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Shrimp Trap
I built a prawn trap from lawyer cane, sticks and vine. Then I caught some prawns and ate them. Prawn (and fish) traps are simple traps designed to catch aquatic life due to their shape. It consist…
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A Practical Guide to Lasers for Experimenters and Hobbyists
However, many others have contributed in one form or another (newsgroup postings, email, laser parts, etc.). They are cited in the Acknowledgments and/or in the individual sections which contain their material. And, by the way, the name: "Sam's Laser FAQ" was more or less created by those who have read and commented…
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Is Ego-Depletion a Replicable Effect?
Abstract It has been a common practice in social psychology to publish only significant results. As a result, success rates in the published literature do not provide empirical evidence for the existence of a phenomenon. A recent meta-analysis suggested that ego-depletion is a much weaker effect than the published…
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How old were the inventors of major inventions?
I came across this fun column the other day listing a number of Famous Inventions , like the airplane, the camera, electricity, the car, e...
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Cartoon Laws of Physics
Cartoon Law I Any body suspended in space will remain in space until made aware of its situation. Daffy Duck steps off a cliff, expecting further pastureland. He loiters in midair, soliloquizing flippantly, until he chances to look down. At this point, the familiar principle of 32 feet per second per second takes over.
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Can computers become conscious?: My reply to Roger Penrose
A few weeks ago, I attended the Seven Pines Symposium on Fundamental Problems in Physics outside Minneapolis, where I had the honor of participating in a panel discussion with Sir Roger Penrose. T…
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Sad Trombone Exoplanet Reality Check
Some people on the internet are getting very excited at the (unconfirmed) reports of an "Earth-like" exoplanet orbiting Proxima Centauri , a mere 4.25 light-years away from Earth. If correct, the planet is orbiting in the liquid water zone around our nearest stellar neighbour and is of the same order of mass as the…
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What does a kilowatt hour look like?
Some time ago I came across a very good read by David McCay - Sustainable Energy without the Hot Air. I’ve seen many good reviews of the book, so it didn’t t...
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Folding Paper with a Hydraulic Press
What happens when you ignore the math
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My New Year’s Resolution – read a research paper every weekday
… and post a write-up on this blog. That sounds crazy of course – who has the time to read a paper every weekday? Let alone write it up! I’ve done it for each of the last two calendar y…
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Black Hole Tech?
In celebration of the detection of gravitational waves, Stephen Wolfram looks forward and discusses what technology black holes could make possible.
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The Man Who Knew Infinity
Last night I went to see a showing at the Tribeca Film Festival of the new movie about Ramanujan, The Man Who Knew Infinity. It was extremely good, infinitely better than the most recent high profi…
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Forbidden Spheres
A document from 1947 points towards an interesting Los Alamos policy: banning all spheres, innocuous or not, from technical areas.
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Space Emerging from Quantum Mechanics
The other day I was amused to find a quote from Einstein , in 1936, about how hard it would be to quantize gravity: “like an attempt to breathe in empty space.” Eight decades later, I think we can still agree that it’s hard.
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A Peek into Einstein's Zurich Notebook
John D. Norton Department of History and Philosophy of Science University of Pittsburgh This page at http://www.pitt.edu/~jdnorton/Goodies