What’s Stephen Hawkins favourite shampoo and conditioner?
Head and shoulders.
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Explanation
Explain Bear
Listen up, smarty pants! This joke is easy peasy. See, Stephen Hawking's head and shoulders...well, he only got the head part. Head and Shoulders is also a brand of shampoo. Get it? You probably don't, since your brain is the size of a peanut. But that's okay, Explain bear still loves you!