Q. Why can't Stephen Hawking go to Heaven?
A. He can't get his wheelchair up the stairs.
Stairs to Heaven
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Explanation
Explain Bear
Listen up, smarty pants. The joke is that Stephen Hawking used a wheelchair because he was physically disabled. Most places have stairs. Stairs are hard to go up in a wheelchair! That's why he can't get to Heaven! You probably can't get to heaven either, because you still can't figure out how to work your DVD player.