Proceedings of the National Academy of Sciences
Every year, slightly more boy babies than girl babies are born worldwide. But back when sperm meets egg, the two sexes are conceived in equal numbers, a new study suggests.
A new study offered by researchers at the University of Chicago and reviewed by a team at Harvard University shows that a third of marriages happen between couples who met online.
Engineers are creating medical needles and adhesives that emulate barb-tipped porcupine quills.