/u/gnex30's posts
Pre-Bronze-Age Earth must have had sufficient easily accessible deposits of copper, tin, iron, gold and other metals in such abundance to equip vast armies. How likely is it that similar metal ore veins can be found in a native state on the surface of Mars?
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Our galaxy is 100,000 light years across, how do astronomers calculate what it looks like "now" using star positions as they appear now?
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Most major cities in the US are built right on rivers flowing through downtown. Why is Atlanta so far from the Chattahoochee?
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Ancient Egyption: Presumably only the best stonecarvers could work on the high profile monuments, but were there any carvers with "bad handwriting"? or places where someone messed up and had throw out a whole block?
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Is mammal dung special? Are mammals comparatively greater consumers of fruits and vegetables, and so have plants evolved to serve primarily mammals? Why is guano so special?
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If neutrinos have mass, can they be slowed down? Could we be living in a dense sea of slow neutrinos that don't have enough energy to be detectable?
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What gives us that feeling whether we "know" something or not? Why is it so hard to get that feeling when studying something hard, yet so easy to get it when told a simple conspiracy theory?
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Orb weaver spiders create these giant webs with numerous connections reaching at least 15 feet, but the web is almost perfectly planar. How can a spider know where the attachment points need to be to all be in the same plane?
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My weather app says there's a 50% chance of rain for the day, but the hourly forecast says 0% every hour. How does the sum of zero probability add up to 50%?
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