NASA scientists say that the Mars Curiosity rover's audacious August 5 landing plan, which involves a hypersonic parachute, retrorockets, and a hovering 'sky crane' system is exactly what is needed for the $2.5 billion rover.
New firms are challenging conventional rooftop solar by using thin-film technology on windows and even indoors. On this Earth Day, conventional Chinese companies are the cost leaders. But US firms have the technical edge.
In a decision that could impact gun control nationwide, a Virginia judge on Wednesday awarded the families of two victims of the Virginia Tech massacre $8 million. Advocates of campus carry say they will use the ruling to press for more gun rights on campuses.