Humans are born with "kinship detectors? that help us stay away from evolutionary disastrous romantic tangles with our siblings, a new study suggests. But it only works if you grow up with the sibling.

Men and women are sure to argue about this one. In fact, the man and woman who led the study don't agree on the meaning of the results.

Fewer sharks swarm near the shore in part because more sharks are being killed every year.

The blood of the largest bat in Europe reveals it can devour birds in midair at night, the only animal known to do so thus far, evidence now strongly suggests.

Kansas has repealed public school science guidelines questioning the theory of evolution, but educators aren't sure how long it will be before the decision is overturned.

Today millions of Americans will say, ?I love you,? with chocolate. Yet the international cocoa industry has paradoxically led to negative impacts on tropical environments and economies, from deforestation to child labor.