In this story, the main character enters his autonomous car (no steering wheel or pedals), which takes him out of the city to a picnic ground. After a pleasant afternoon, the car takes him back to the city, but travels through a tunnel. The tunnel entrances close. When the entrances open the cars exit, empty, clean, and slightly damp. This is the means of population control - car occupants have been liquefied and flushed away.
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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