Wikipedia / LightSail2

Sometimes the most advanced forms of technology are also the simplest. The LightSail 2, a satellite conceived by Bill Nye's non-profit Planetary Society, has proven that a satellite can orbit the Earth fueled completely by the sun. The concept, dreamed up 400 years ago by Johannes Kepler, has finally become a reality.

The LightSail 2 doesn't run on solar panels but instead solar sailing – an entirely different concept. It's kind of like a sailboat, but instead of using wind to make it move, it's powered by photon particles from the sun that bounce off of a sail made from a large reflective surface. The photon particles give it a "tiny push no stronger than the weight of a paperclip," Nye told CNN.

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Planet

If you've ever thought to yourself, "Hm, I wonder how close we are to actually creating artificial intelligence," the answer is IBM's Watson.

The supercomputer/"Jeopardy" champion/Ridley Scott advisor is basically the closest we've come as a species to creating a machine that can think for itself. Well, the closest we've come so far.

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Heroes