1.   By working in groups, ancestral humans were able to eat, and avoid being eaten.

2.   Cole said he believes the result is identical to the ancestral human defensin, the one that would have occurred naturally before the mutation appeared.

3.   Not random acts of altruism, but specifically the sorts of behaviors that redounded to the benefit of ancestral humans.

4.   The researchers discovered a number of intriguing things about how ancestral humans may have spent their dark winter nights.

5.   The same horse, if it chose in its solipsistic modernity to look your way, would see only the rapidly receding ancestral human in you.

6.   Those dogs that were nice to ancestral humans lived long enough to have puppies.