Why do some women grow beards?
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The entire mass of the asteroid belt only amounts to ~ 4% of the mass of the Moon
magneto-rheological and electro-rheological fluids
Also, could we make a "heavy" proton from a couple of top quarks and a bottom quark?
The optimum trajectory isn't actually vertical initially, but it is quite steep- any time a rocket isn't firing at least slightly sideways it's wasting fuel because it needs to go sideways very fast to reach orbital speed.