♦ Plutonium - first weighed on August 20th, 1942, by University of Chicago scientists Glenn Seaborg and his colleagues - was the first man-made element.
♦ Sound travels 15 times faster through steel than through the air.
♦ Only one satellite has been ever been destroyed by a meteor: the European Space Agency's Olympus in 1993.
♦ A ball of glass will bounce higher than a ball of rubber. A ball of solid steel will bounce higher than one made entirely of glass.
