It was 1974 and Art Fry was spending his weekend singing for the local church choir. On this particular Sunday, Fry was dealing with a relatively boring problem: he couldn’t keep his bookmarks in place.
Let’s imagine I set two piles of money in front of you. One pile has $120 in it. If you want it, you can have it tomorrow. The other has $450 in it. You can have that pile…