Stephen Hawking doesn't go for a stroll. He goes for a roll.
Hawking's Roll
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Explanation
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Explain Bear
Alright, listen up, genius. Stephen Hawking was a smart dude who used a wheelchair. Instead of saying he goes for a "stroll" (which means a leisurely walk), the joke says he goes for a "roll" because he's in a wheelchair. Get it? You probably don't, because you're reading this explanation. You probably think the mitochondria is the powerhouse of the cell, huh?