Sea otters hold hands when they sleep so they don't drift apart.
Men with older sisters are less likely to be competitive, a new study finds.
Recordings released by NASA show just how noisy space can be if you know how to listen.
Whether because of inaction, rejection, or pure skullduggery, these 15 of New York City landmarks have been lost forever.
Americans are obsessed with Finland's educational system. But what exactly are the main differences that contribute to Finland’s success?