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The most popular blog posts about science & space on Hacker News. 182 posts.
Temperature is certainly a factor when growing ice spikes, and we have done experiments that show that spikes are more likely to form when the temperature is just below freezing (see the graphs below). I'm not entirely sure why this is so, but I suspect that the ice tube freezes shut before the tube gets very long if…
In French, the word for potato is pomme de terre. This literally translates to apple of the earth. By this logic, potatoes are the lowest-hanging fruit of all. More seriously: We keep getting more …
About a million years ago, I was discussing the FOAF (Friend of a Friend) ontology with its early proponents. It allowed you to define a machine-readable semantic relationship like "Alice is married to Bill" and "Bill is Carol's child" and "Carol works for David". That sort of thing. At the time, all the FOAF…
Bureaucratic and logistical roadblocks, not the science, stand in our way
Students of military history know that acoustic refraction and unusual audibility have often played significant roles in the outcome of battles. Before electrical and wireless communications became common on the tactical level, the sound of battle was often the quickest and most efficient method by which a commander…
Update: a version of this post appeared on Slate.com. I seem to have touched a nerve with my rant about the conventional teaching of music theory and how poorly it serves practicing musicians. I th…
This post is an unofficial sequel to one of my first blog posts from 2007, which was entitled “Quantum mechanics and Tomb Raider”. One of the oldest and most famous allegories is Plato&…
Eight studies reveal a (possibly universal) bias in human imagination
Lessons from Atlantropa, the megaproject to unite Europe (& erase Africa)
While reading up on architecture in Japan recently, I came across a technology that I hadn’t heard of before: the Ene-Farm. It’s a domestic energy system that is being used in Japan and…
If you’re ever near a relatively low flying airplane, you may have noticed that it sounds like it’s in a different spot in the sky than where it actually is. You can hear the loud engines, and your ears tell you it should be in one place, but your eyes tell you it’s clearly well ahead of its noise. It’s a funny visual…
In February 2022, Jim Keller organized a scientific anarchism event in Woodside, California. Scientific anarchism, a term borrowed from the controversial philosopher of science Paul Feyerabend, concerns the way science is performed in the laboratory and the way that ideas are generated, refuted, and incorporated into…
"They would have eaten our whole house and probably the whole cul-de-sac if we didn't find those jelly beans."
For the first time in ~40 years (? – see below) New Mexico’s Rio Grande has “broken” – is no longer flowing – in what we call “the Albuquerque reach”…
People who say “science is political” usually aren’t just stating facts - they’re trying to push something on you. Don’t let them
Whenever a student wonders why linear algebra, matrices, and vectors are important, the response from teachers usually sounds like this:
A deeper analysis of the events which caused a Kazakh airliner to go out of control over Portugal in November 2018.
The strange interactions of Selfhood and Multiplicity
Dissolve MSG in water to form a saturated solution. Wait for small MSG crystals to form. Then, tie it to a string to let it grow bigger.
Noether's theorem is an amazing result which lets physicists get conserved quantities from symmetries of the laws of nature. Time translation symmetry gives conservation of energy; space translation symmetry gives conservation of momentum; rotation symmetry gives conservation of angular momentum, and so on.
Spoiler alert: I found some intriguing patterns…
If you want to watch the video first, it is below
Bill Harris points to this cartoon from Randall Munroe. I think he (Munroe) is really on to something here. Not about Bayes’s theorem but about the sorts of examples that are in textbooks.
It was a dreary afternoon in Milan last year when, procrastinating on studying, I was struck by a flash of genius. “What would happen if I made a banana-powered random number generator?“. I immediately went to tell my roommate, who was also an electronic engineer.He looked me in the face and burst out laughing. At ……
On GPT-3: meta-learning, scaling, implications, and deep theory. The scaling hypothesis: neural nets absorb data & compute, generalizing and becoming more Bayesian as problems get harder, manifesting new abilities even at trivial-by-global-standards-scale. The deep learning revolution has begun as foretold.
[ An updated treatment of this material appears in Chapter 1 of the Energy and Human Ambitions on a Finite Planet (free) textbook , and also appears as part of an article in Nature Physics in 2022.]
What if I took a swim in a typical spent nuclear fuel pool? Would I need to dive to actually experience a fatal amount of radiation? How long could I stay safely at the surface?
