Melissa Miller started a project called Bad Science Jokes back in 2012 when she was in high school. She had a science teacher that would give extra credit for a science joke, and so she saw and heard a lot of them. Her collection was very popular on Tumblr, and then moved to Instagram. Some consider it just a meme page, but she also hears from students who credit the jokes in helping them to remember important concepts to get through science class.
Bored Panda picked out a bunch of these jokes that are both funny and understandable to anyone with a passing knowledge of science. See 40 of them in a list ranked by votes. Some of them are actually good science jokes!