Jul 01 Watch Cassini Enters Saturn's Orbit The NASA spacecraft Cassini entered Saturn's orbit on Wednesday and transmitted back to earth unprecedented images of the planet's rings. Senior correspondent Ray Suarez discusses the mission with scientist Kevin Grazier from the NASA Jet Propulsion Laboratory. Continue watching
Jul 01 Watch U.S. Battles Invasive Species Of the 50,000 non-native plant and animal species that have arrived in the United States from foreign countries, many are considered invasive and cost an estimated $138 billion a year in environmental and economic damage. Continue watching
Jun 21 Privately Funded Rocket Plane Reaches Outer Earth Atmosphere The first privately funded spacecraft punched the outer edge of the Earth's atmosphere before safely gliding back to Earth Monday in front of a crowd gathered to watch the historic flight. Continue reading
Jun 03 Watch The Intersection of Politics and Science on a North Carolina Pig Farm A group of prominent American scientists recently wrote a report accusing the Bush administration of "misrepresenting and suppressing scientific knowledge for political purposes." Jeffrey Kaye explores the intersection of politics and science on one North Carolina pig farm. Continue watching
Jun 02 Watch Predicting Earthquakes Scientists are learning more than ever before about the structure and properties of the Earth's crust and upper mantle -- bringing them to the brink of discoveries about earthquakes that could one day save millions of lives. Continue watching
May 26 Watch Magicicada: Scientists Study Swarming Cicadas The largest group of periodical cicadas -- called Brood X -- emerged this month after 17 years underground. Jeffrey Brown investigates the biology and culture of these cyclical insects. Continue watching
May 20 Watch Climate Change The NewsHour's Science Unit examines how climate change could affect large numbers of species. Continue watching
May 11 EPA Issues Off-Road Diesel Pollution Rules By PBS News Hour Environmental Protection Agency chief Mike Leavitt signed new regulations Tuesday aimed at cutting pollutants from diesel engines in off-road vehicles such as farming and construction equipment by 90 percent over the next eight years. Continue reading
May 05 Watch Electronic Voting The commission Congress created to investigate the security of electronic voting machines said the software is not reliable enough for use in the 2004 presidential election. Spencer Michels looks at the controversy in California over electronic voting methods. Continue watching
Mar 30 Months After NASA Decision, Hubble Debate Still Simmers More than two months after NASA announced it will no longer service the Hubble Space Telescope, scientists and the general public are still hoping the agency will change its mind. Continue reading