Joke #1:
Q - How does an RE like his eggs?
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A - Over 20mm!
Joke #2:
Q - Why did the RE cross the road?
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A - Because there was an affluent, infertile woman in her 30s on the other side.
Joke #3:
Q - Why does it take 50 million sperm to fertilize one egg?
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A - Because they won't ask for directions either!
If you guys know of more, please put them in your comments and I'll add to this master list. :-)