Aug 15 Watch Clearing the Air Mayors across the country have united to pledge support for the Kyoto Protocol despite the Bush administration's concerns the treaty to curb greenhouse gases will hurt the U.S. economy. Continue watching
Aug 12 NASA Launches Mars Orbiter By PBS News Hour An Atlas V rocket roared into space Friday morning, launching a sophisticated NASA probe on its seven-month journey to Mars from Cape Canaveral Air Force Station in Florida. Continue reading
Aug 12 Watch Mars Mission An Atlas V rocket roared into space Friday, sending a sophisticated NASA probe on a seven-month journey to Mars. NASA's chief scientist discusses its newest mission to the red planet. Continue watching
Aug 12 Watch The O’Shaughnessy Dam Debate Correspondent Spencer Michels reports on the battle over the 100-year-old O'Shaughnessy Dam in Northern California. Continue watching
Aug 10 Watch New Grazing Rules Tom Bearden of the NewsHour's Science Unit takes a look at some upcoming rules on private cattle grazing on public land and the effects they may have. Continue watching
Aug 09 Shuttle Discovery Safely Returns to Earth By PBS News Hour Discovery and its seven astronauts safely landed Tuesday morning at Edwards Air Force Base in California after a two-week mission that involved unexpected repair spacewalks and a visit to the International Space Station. Continue reading
Aug 09 Watch Shuttle’s Safe Return The space shuttle Discovery glided to a landing at Edwards Air Force Base in California early Tuesday morning after a 14-day mission. Jeffrey Brown talks about the shuttle's return and what comes next in NASA's space program with two experts. Continue watching
Aug 03 Astronaut Pulls Strips From Shuttle’s Tile Belly By PBS News Hour Astronaut Stephen Robinson gently plucked two protruding and potentially dangerous fiber strips from the space shuttle Discovery's underbelly Wednesday in an unprecedented emergency repair. Continue reading
Aug 03 Watch Space Shuttle Repairs An astronaut gently plucked two protruding and potentially dangerous fiber strips from the space shuttle Discovery's underbelly Wednesday. The first American woman to walk in space weighs in on the repair job. Continue watching
Aug 02 Watch NASA Weighs Decision to Repair Shuttle On Monday, NASA weighed trying an in-space repair to the shuttle Discovery. Following a background report, Keith Cowing, editor of NASA Watch, assesses the situation. Continue watching