Experts are growing increasingly concerned that the United States will have to rely entirely upon Russia to take astronauts to and from the international space station for at least half a decade.
A growing number of Americans are refusing to wait for manufacturers to deliver mainstream electric vehicles. So they're ripping out their gas-guzzling engines and replacing them with electric motors -- and they say just about anyone can do it.
Some teachers believe sites like MySpace and Facebook help them connect with their tech-savvy students about homework, tutoring and other school matters. But others fear the social-networking sites are breeding inappropriate relationships between teachers and pupils.
"Renewable petroleum" is now a reality in some laboratories, although on a microscopic scale. A California biotech company is feeding plant material to genetically altered E. coli bacteria, which then excrete the equivalent of diesel fuel.
You've heard of hybrids, electric cars and vehicles that can run on vegetable oil. But of all the contenders in the quest to produce the ultimate fuel-efficient car, this could be the first one to let you say, "Fill it up with air."