A science fair

A: You leave town, your wife takes off. Maybe there’s, um, a close friend she might be spending some time with.
B: Excuse me, that’s very rude. He is a dedicated husband and father. I have seen him with his wife, let me tell you, they’ve got more chemistry than a science fair.

Question: May I know what “a science fair” means? The “fair” here is like the fair of book fair, toy fair, trade fair?
Thank you!!!

Its usually a fun little competition/exposition for kids (up to high school) to learn about some science topic and then create a display during the fair that judges and other students/parents can walk around to learn what the kids learned about.

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