What’s common knowledge in your field, but shocks outsiders?

Some computer Flash Memory relies on electrons 'magically' transporting from one side of an insulator to another via quantum tunnelling.
Reposted from oddgoo
What’s common knowledge in your field, but shocks outsiders?

Your immune system does not just protect you from pathogens and parasites, it is constantly gardening you: tissues do not turn over and renew on their own, immune cells show up and oversee the whole process.

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