Emil Leon Post was a really smart guy who lived a long time ago and came up with something called the Post Correspondence Problem. It's like a puzzle where you have to match up a set of cards with symbols on them in a certain way.
Imagine you have some cards with pictures on them, like a fish, a bird, and a dog. You also have another set of cards with different pictures on them. Your job is to figure out which cards from the first set should go with which cards from the second set so that they match up perfectly.
This might sound easy at first, but it can be really tricky! Emil Leon Post was one of the first people to study how to solve these kinds of puzzles, and his work helped other people come up with new ways to solve all kinds of different problems.
So, people who study math and science still remember Emil Leon Post today because of his important contribution to solving tricky puzzles!