Here's your hilarious joke:

Only 40% of men ever reproduced... Did you know that pre-agricultural revolution, 80% of women reproduced but only 40% of men did? This is thought to be because men would often engage in higher risk behaviors such as defending their territory and hunting down mammoths. Hunting down mammoths was particularly dangerous. It was in fact so dangerous that 9 out of 10 historians did not recommend it... The other one got laid.

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