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Questions tagged [reproduction]

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14 votes
4 answers

Do we know why animals have evolved to have sex for reproduction?

I've been reading 13 Things That Don't Make Sense: The Most Intriguing Scientific Mysteries of Our Time (2010) and Chapter 10 concentrates on the subject of Sex. The author argues that we do not know ...
19 votes
2 answers

Can a pair of rats multiply to 200 within a year?

A story on the BBC News website makes the following claim: Brown rats are one of the planet's most serious mammalian pests, ruining crops and harbouring disease. Expert jumpers, climbers and ...
6 votes
1 answer

Is it safe for nursing mothers to dye their hair?

My wife has been abstaining from dying her hair during pregnancy. Now the baby is born, I suggested she could use the dye again. She said no. A search online was inconclusive: A pregnant woman at ...