In 1985, graphic novelist Alison Bechdel came up with criteria for whether she'd watch a movie. It's become known as the Bechdel test, and it's surprisingly hard for films to pass these days. After ...

In science, a variable is something that can be changed, measured or controlled in an experiment. Scientists look at variables to understand how they affect things. A variable is any one of the things ...

Fran: Scientists love to find things out and they love questions but not all questions lead to a fair test. What do I mean by that? Well, say I wanted to see how fast I can make my ball travel on ...