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z2trillion's comments

z2trillion | 2 years ago | on: Conway's Game of Life is omniperiodic

From page two of the paper: "Low-period oscillators in Life, roughly p ≤ 15, can be found by playing with patterns by hand or using brute force computer searches. In 1996, David Buckingham demonstrated [6] using his “Herschel conduits” that one can construct oscillators with p ≥ 61 by sending signals around a closed track; the cutoff for systematically constructing oscillators was later improved to p ≥ 43, by Mike Playle’s discovery of the Snark [43]."

z2trillion | 3 years ago | on: The Schwarzschild Defence

The bobbles retain their mass. There is a scene in the book where a bobble floats aways because it was created during the day, and at night the surrounding air cools enough for the bobble to effectively become a hot air balloon.

As far as I know, the book doesn't cover if the bobble retain their angular momentum or charge.

z2trillion | 4 years ago | on: How I Shot This Lunar Eclipse Sequence in Camera, on Film

He must have re-pointed the camera between exposures of the moon. In the article, he says that because of a camera malfunction, he had to capture a shorter interval than originally intended. He did this without changing the template he had put into the camera's viewfinder.

https://www.timeanddate.com/eclipse/in/australia/sydney?iso=... has the direction and altitude for the moon as viewed from Sydney during the eclipse. I suspect that if plotted out, they'd trace out something pretty close to a straight line.

z2trillion | 4 years ago | on: Different browsers see different colors

I think the confusion arises because because people (the author of the article included) confuse "color" and "spectral color". Spectral colors are what you when you look at light of a single wavelength, e.g. a green 520nm laser pointer. Not all colors are spectral colors, e.g. you'll see purple if you look at a source that produces 600nm and 450nm light, which is a color that can't be produced by any single wavelength.

Coming back to the color of the sun, it (the sun + the atmosphere) emits light over a range of wavelengths, which we usually perceive as white.

z2trillion | 4 years ago | on: FiatMarketCap

I think the site is reporting M2 for each of the currencies, which includes much more than just the bills + coins. E.g. the value of all USD coins + bills is "only" $2.1 trillion [1] vs. an M2 that's 10x larger. The 60% of all USD are held overseas statistic only applies to coins + bills and not M2 [2].

An explanation could be that people in Chinese save more and keep more of their savings in banks, compared to Americans?

[1] "Currency in circulation" in https://www.federalreserve.gov/releases/h41/20210506/ [2] https://www.bullionstar.com/blogs/jp-koning/how-much-u-s-cur...

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