ELI5: Explain Like I'm 5
Examples: black scholes model, inlet manifold, how does ethereum work, options backdating, evolutionary genetics

Guttman scale

A Guttman scale is like a ladder! It's a way of ranking different things based on how related they are. For example, if you wanted to figure out which type of animal is most like a dog, you could use a Guttman Scale. You could rank each animal from most like a dog to least like a dog to help you figure out the answer.