GREIFSWALD, GERMANY - OCTOBER 29: A worker emerges from a tight corner under the Wendelstein 7-X experimental fusion reactor at the Max Planck Institute for Plasma Physics on October 29, 2013 in Greifswald, Germany. Scientists hope to heat a miniscule amount of hydrogen to 100 million degrees in order to melt the atomic cores into helium, thereby releasing large amounts of energy in a similar way as the sun. Due to be completed in 2014, the reactor could help scientists to get closer towards creating atomic fusion-based commercial power, which would be clean and virtually inexhaustible, as hydrogen comes from water. (Photo by Sean Gallup/Getty Images)
