George Pocock was an English schoolteacher and inventor of the "Charvolant", a kite-drawn carriage. Here's the official website of the Wright Brothers (the inventors of the first successful flying machine or airplane). Speaking of sustainable forms of energy, let's talk about biofuels. Are they the answer? Biofuels can provide energy without the reliance on environmentally harmful fossils fuels -- but scientists are still searching for a plentiful source. Craig A. Kohn demonstrates how cellulose, the naturally abundant tough walls of plant cells, might be the solution. Some argue that if we consumed less energy, we wouldn't have to worry about an energy crisis. What are ways that we can use less energy? Electric cars? Forget about the hybrid auto -- Shai Agassi says it's electric cars or bust if we want to impact emissions. His company, Better Place, has a radical plan to take entire countries oil-free by 2020.

Next Section »