AP - Scientists say they have found dinosaur tracks on the Arabian Peninsula, a discovery they say may shed more light on where dinosaurs lived, their migration patterns and how they evolved they way they did.

AP - The state of Alaska will sue to challenge the recent listing of polar bears as a threatened species, Gov. Sarah Palin announced Wednesday.

AP - In a stroke of cosmic luck, astronomers for the first time witnessed the start of one of the universe's most fiery events: the end of a star's life as it exploded into a supernova.

Reuters - The last two Atlantic hurricane seasons passed with barely a stir in south Louisiana, sparing New Orleans another disaster. But some local officials fear the respite may have contributed to a false sense of safety in parts of the city that still face great danger.

AP - A Northern California biotech company announced Wednesday that it will clone dogs for the five highest bidders in a series of online auctions. Some ethicists condemned the offer, fearing it could lead to human clones.

AP - The "Big One," as earthquake scientists imagine it in a detailed, first-of-its-kind script, unzips California's mighty San Andreas Fault north of the Mexican border. In less than two minutes, Los Angeles and its sprawling suburbs are shaking like a bowl of jelly.

AP - The Bush administration relied on a flawed study to conclude that research on a highly infectious animal disease could safely be moved from an isolated island laboratory to sites on the mainland near livestock, congressional investigators concluded in findings obtained by The Associated Press.

AP - Chain saws scream in a northern Michigan forest, but it's not the familiar sound of lumberjacks.

Reuters - Excited astronomers said on Wednesday they had for the first time caught a supernova on camera just as it was exploding, and they may now learn how to spot others.

AP - In a stroke of cosmic luck, astronomers for the first time witnessed the start of one of the universe's most fiery events: the end of a star's life as it exploded into a supernova.

AFP - Researchers say they have found about half of the universe's missing matter hidden in the spaces between billions of galaxies thanks to the Hubble telescope.