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
Mar 30 Watch Mission’s End? Since 1990, the Hubble Space Telescope has been supplying scientists with reams of information about our universe. Tom Bearden reports that, despite its successes, safety concerns may prevent NASA from making the necessary repairs to the telescope. Continue watching
Mar 23 Mars Rover Spies Evidence of What Was Once Pool of Water NASA scientists announced Tuesday that they believe the Mars rover Opportunity has found what used to be a briny pool of standing water at least 2 inches deep. Continue reading
Mar 19 New Fish Guidelines Issued, Prompted by Mercury Concerns Worries that the mercury in certain fish could harm young children prompted the government Friday to issue new guidelines for eating fish. Continue reading
Mar 02 Watch Water On Mars NASA announced Tuesday the discovery of evidence that water once existed on the surface of Mars, creating conditions that may have supported life. NASA scientist Jim Garvin explains the findings and implications. Continue watching
Feb 19 Watch Red Rovers The Spirit rover drove into a Martian hollow, while halfway around the planet, its twin dug a trench with one wheel to investigate the soil's content. Ray Suarez discusses the latest findings with Steve Squyres of Cornell University, principle investigator… Continue watching