Apr 06 Watch Estrogen Study Lead Researcher on Risks, Benefits of Hormone-Replacement Therapy Once a popular treatment for menopause symptoms, hormone-replacement therapy had come under scrutiny for raising the risk of certain diseases, but a new study found a reduced risk of breast cancer and other benefits for some women. Jeffrey Brown discusses… Continue watching
Apr 06 Heavy Rockets, Higgs and TV Science Company Planning Biggest Rocket Since Man on Moon Space X's Falcon Heavy rocket will be the most powerful heavy rocket ever built, primed to carry twice as much weight into orbit as a NASA space shuttle, according to… Continue reading
Apr 06 Nuclear Reactors and Nuclear Bombs: What Defines the Differences? By Jenny Marder What is the difference between the nuclear material in a bomb, versus a reactor? A nuclear reactor works by using the energy that is released when the nucleus of a heavy atom splits. That process is called fission. In reactors,… Continue reading
Apr 04 Miles O'Brien: Cracks in the System at Southwest If you have ever unwound and bent a paper clip to and fro until it snapped, you understand the concept behind metal fatigue. Railroad engineers in the late 19th century were the first to recognize the problem. As… Continue reading
Apr 04 Staring at the Sun By Jenny Marder As the sun enters its stormy season, and as GPS systems and electricity networks become increasingly vulnerable to solar eruptions, NASA scientists are working to better understand the mysteries of space weather. Continue reading
Apr 01 'Lord of the Tree Rings' Peers Into the Past There's an interactive spirit at the University of Arkansas' department of geosciences, where dendochronologist David Stahle encourages visitors to touch a cross-section of a redwood tree. In the latest Science Nation series for the National Science Foundation*, NewsHour… Continue reading
Mar 31 Japan's Radioactive Leak: What Are the Long-Term Consequences? By Talea Miller Fukushima nuclear power plant. Environmental and nuclear scientists in the U.S. are watching apparent leakage discovered at the Fukushima Daiichi nuclear reactor site this week with a concerned eye, for both health effects and impact on the environment. Japanese safety… Continue reading
Mar 30 Miles O'Brien Visits Deserted Town at Chernobyl The nuclear crisis in Japan has churned up memories of the Chernobyl meltdown, the worst nuclear accident in history. Miles O'Brien and crew returned last week to survey the scene, 25 years later. They took pictures of abandoned dolls, homes,… Continue reading
Mar 30 Miles O'Brien Visits Deserted Town at Chernobyl By Vanessa Dennis, Miles O'Brien The nuclear crisis in Japan has evoked memories of the Chernobyl meltdown, the worst nuclear accident in history. Miles O'Brien and crew returned last week to survey the scene, 25 years later. Continue reading
Mar 30 President Obama Presents Energy Plan, Calls for Cut in Imports of Foreign Oil EmbedVideo(262, 482, 304); In a speech Wednesday at Georgetown University, President Obama outlined his goals for reducing American energy dependence, heavily emphasizing new technology and alternative sources in addition to "safe and responsible" offshore drilling. He was quick… Continue reading