In Revolution, episode 4, one of the militia guys says that they can't make bullets anymore. As far as I know, bullets were made before electricity. All that's needed is gunpowder, which the Chinese made a few thousands of years ago, and lead. I know that mass producing them would be difficult without electricity, but other than that, what would prevent anyone from making new bullets? Was there any further explanation given that I just didn't see?
In the movie Martian, why does Mark use Hexadecimal to communicate with NASA? Couldn't numerals from 0 to 9 sufficed for indicating the number corresponding to the alphabet?
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