Prove It

Prove It is the second half of the fourth episode of season 4. Together with "The Contest", it first aired on September 27, 1999. It was written by Joe Fallon and the storyboards were done by Jeremy O'Neill.

Premise
With Arthur off doing his homework, D.W. spends some quality time with the Brain. She learns about many things in science. When Arthur refuses to go with her to the Exploratorium, she makes her own in the back yard. She makes many false theories about science and spreads them to her friends, but Arthur can't think of how to prove them wrong. He ultimately takes her to the Exploratorium to explain how things really work.

Memorable Quotes
Arthur: There's water in the hose. That's it.

Goofs

 * When The Tibble Twins raise their hands, Tommy has Timmy's blue scarf and Timmy has Tommy's red scarf then in the next shot of the Tibbles they have their regular scarves again.

Home video
This episode has never been released on VHS or DVD.