When I was a kid, I sometimes played basketball on a schoolyard court next to a brick wall. Bouncing the ball, I’d notice its sound repeated a split second later from the wall’s direction. It sounded a little different, but it was clearly the…
When I was a kid, I sometimes played basketball on a schoolyard court next to a brick wall. Bouncing the ball, I’d notice its sound repeated a split second later from the wall’s direction. It sounded a little different, but it was clearly the…