# When Are Two Things the Same?

Take a look at the following two graphs, and tell me what you think of them:

Take a look at the following two graphs, and tell me what you think of them:

My family and I play a lot of Scrabble, which is a word game where you have to use tiles with letters on them to make words on the board. The board containes multipliers that also give you more points, as well as the tiles themselves, which each have a certain number of points associated with them.

For those who don’t study mathematics but have an interest in science, the term “differential equation” will often come up in conversation. They are often said to be really important to all scientific disciplines, but what *are* they exactly, and how do they help us describe the world?