I worry about the germs in the holes of bowling balls. Nobody cleans those holes. There are years of impacted pizza fingers in there. Taco fingers. Chicken fingers. I'm amazed those balls still have holes. Ever smell a bowling ball hole? You think the balls are knocking down the pins? You're wrong. The pins are passing out from the smell.
First vertical flightIn 1907, the Bréguet-Richet Gyroplane No. 1 made what is generally accepted as the first vertical flight, hovering about 2 feet (0.6 meters) off the ground for one minute, powered by a 45 h.p. engine. It was built by the brothers Louis and Jacques Bréguet with assistance from Professor Charles Richet. It lacked stability, any control system, and it needed four men to steady it while it hovered, so it did not represent a practical helicopter. (Some sources give the date as 29 Sep 1907.) |
