We tie our shoes, we put on neckties, we wrestle with power cords. Yet despite deep familiarity with knots, most people cannot tell a weak knot from a strong one by looking at them, Johns Hopkins ...

Alysa Liu became the first American since Kimmie Meissner in 2006 to claim the women's world figure skating title Teenage American figure skater Alysa Liu claimed the women's world title in Boston ...