Todd Halvorson Latest articles by Todd Halvorson Explorer I Launch Team Recalls America's First Satellite By Todd Halvorson published 31 January 08 Space Exploration Sign up for the Live Science daily newsletter nowGet the world’s most fascinating discoveries delivered straight to your inbox.Contact me with news and offers from other Future brandsReceive email from us on behalf of our trusted partners or sponsors LATEST ARTICLES1Farthest 'mini-halo' ever detected could improve our understanding of the early universe2Dwarf sperm whale: The 'pint-size whales' that gush gallons of intestinal fluid when surprised 3Scientists invent weird, shape-shifting 'electronic ink' that could give rise to a new generation of flexible gadgets4Are cats the only animals that purr?5A unique new blood type and 'spiderwebs' on Mars
