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Update: The physics department has recruited an astronomer who studies meteor fireballs.
Explain: https://www.explainxkcd.com/wiki/index.php/3061:_Water_Balloons
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Alt text:
Update: The physics department has recruited an astronomer who studies meteor fireballs.
Explain: https://www.explainxkcd.com/wiki/index.php/3061:_Water_Balloons