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11
votes
1answer
981 views

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 ...
3
votes
0answers
242 views

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 ...
11
votes
4answers
2k views

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 ...