The reason Stephen Hawking died was because he switched WiFi routers from Sky to Virgin, so his computer lagged out.
Hawking's Internet Problems
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Explanation
Explain Bear
Listen up, buttercup. This joke is basically saying Stephen Hawking kicked the bucket because he messed with his internet. Sky and Virgin are internet providers in the UK, and switching them up supposedly made his computer run so slow it offed him. It's dumb, I know, just like you.