#2959: Beam of Light
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Transcript
[Albert Einstein (a relatively young version, drawn with dark curly hair and a dark moustache) sitting on a chair, with a thought bubble above his head. There are papers, books and a cup on the desk in front of him.]
Einstein (thinking): Nyoooooooooom!
Einstein (thinking): I'm so fast!
Einstein (thinking): Nyyooooooooom!
[Caption below the panel:]
The first few times Einstein imagined flying alongside a beam of light, he didn't have any particular insights.
(Sourced from explainxkcd.com)
Title text:Einstein's theories solved a longstanding mystery about Mercury: Why it gets so hot. "It's because," he pointed out, "the sun is right there."