And human moms aren't alone here ... than normal thanks to their brain's salience network. Scientists think giving birth activates this network to help a mother detect threats and protect her ...

But with talk of future space colonies and cities on Mars, there's a good chance that one day humans will give birth somewhere beyond Earth, and that brings up some interesting questions.

Part two of a 7-part series in which Robert Winston looks in detail at the life of the human body in chronological order from birth to death ... is shown in detail as is the development of the ...