It’s hard to overstate the shock astronomers felt when the true nature of quasars began to dawn on them in the early 1960s.
Ancient quasar can give clues to the dawn of the universe
Tag Archives: distances
Study: Running Not so Bad for Your Joints After All
Perhaps because it seems intuitively true, the notion persists that running, especially when done long-term and over long distances, is bad for the joints. Indeed, it would be hard to think otherwise when with each foot strike, a runner’s knee withstands a force equal to eight times his or her body weight — for a 150-lb.