I learned a few interesting things in chemistry this morning:
Imagine a computer set to count one million integers each second, starting at one. To get to Avogadro's number (6.022 x 10^23) would take 19 billion years, longer than the estimated age of the universe.
Phosphorus was discovered by crystallizing the fumes from the residue of boiled urine. Furthermore, white phosphorus (the form discovered) ignites spontaneously in air, meaning the guy who discovered it must have spent a lot of time boiling pee - long enough to figure out to protect it from air - before he got to the point of discovery.
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