Will I have to work on Saturdays? http://ducknet.co.uk/books/ardis pharmacy viagra echeck accepted “The Perseids are the good ones,” says meteorite expert Bill Cooke of NASA’s Marshall Space Flight Center in Huntsville, Ala. Known for producing fireballs that might streak across a third of the sky, the Perseids owe their brilliance to the speed — nearly 134,000 mph — with which they smack into the upper atmosphere. “It’s also because of the size of the meteors,” Cooke says — dust grains about one-fifth of an inch across that burn nicely as they zip overhead.