A quick one, since I should already be in bed:
The latest Veritasium video talks about a problem with computers that we can’t eliminate: bit flips caused by cosmic rays and interstellar particles. You would think it would be impossible to detect a single bit flip in 64 bit computers with gigabytes of RAM, but he cites several provable examples, some which people have been recorded and documented. (One of them proving why electronic voting is a bad idea and should always be done on paper ballots.)
There is another way bit flips can happen. Bits in a computer are not actually “on and off”, charged or no charge. They’re high and low states of charge, and if an improper charge is in between, a bit can be interpreted as on, off or both.