Why did Stephen Hawking die?
Because his son wanted to charge their phone, so they unplugged him.
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Explanation
Explain Bear
Listen up, buttercup. The joke is based on the fact that Stephen Hawking used a machine to help him breathe. The joke implies the son killed his dad by unplugging the machine so he could charge his phone. You are probably too dumb to get that since you think that the Earth is flat.