Count Guido Roberto Deiro figures he probably tripped over several meteorites in his day and never even knew it. But when the 72-year-old Las Vegan really started looking, he hit the jackpot. On March 3, Deiro's first hunting expedition, he discovered a 13.7-kilogram, pear-shaped hunk of cosmic stone -- said to be the largest intact meteorite ever found in Nevada. Read more