Q: Why was there thunder and lightning in the lab?
A: The scientists were brainstorming!

Explanation: I love a good thunderstorm!  Especially if I am safe inside.  A brainstorm is not a real storm but a way to gather ideas

When people brainstorm they make a list of many ideas.  Scientists brainstorm ideas for experiments and possible answers or explanations to questions they have.  (A lab is a place where some scientists work.)

This joke is funny because it plays with the words storm/ brainstorm.

Here is what a thunderstorm looks like.  Remember: do not go out in a thunderstorm!