Human childbirth can be a long, painful, drawn-out process, needing assistance and sometimes taking days. So why do close living relatives like chimps have an easier labour, giving birth in hours ...

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.