This and the pic of the inside probably belong on r/techsupportgore

So they don't slip on tile floors and their feet don't get cold? Like hospital patients everywhere.

By accident, followed by a dare, I assume. This was probably how many cheeses, yogurts, beer, etc. were invented. It didn't kill the first people who ate it, and they found it tasty, so they kept recreating it until they found ideal conditions.

Maple sap runs in the spring, when the trees are pushing it quickly out towards the branches for new leaf growth.