Elon Musk has reportedly offered his sperm to help colonize Mars. It's unclear if that's possible.
Briefly

Elon Musk offered his sperm for a Mars colony, leading secretive SpaceX teams to explore reproduction challenges on the red planet.
Musk's ambition for a Mars settlement includes a focus on reproduction but the feasibility of human reproduction on Mars remains uncertain due to environmental factors like high radiation and low gravity.
Read at Business Insider
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