A new study finds that a component of the sperm membrane tightly controls a crucial step in fertilization, making it a prime target for efforts to either assist fertilization or prevent it.
The fittest of the "Greatest Generation," the now-elderly men who played varsity sports before serving in World War II, have a message for the younger generation: "Get off your duff, kid!"
Chill with impunity through this winter’s extreme cold – and brace for the next summer heat wave, when fiery temperatures and air pollution conspire to fill hospitals and morgues.