Two studies make similar strides in identifying how mankind came to populate the Earth, but their differing approaches to gathering and using samples open up ethical questions.
There's a strong case to be made that the first species cultivated by humankind was brewer's yeast, and a generation of researchers will drink to that.
If cheapskates are born and are not entirely the product of learned behavior, as a growing body of research suggests, policies to promote frugal living may do little good.