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Season 11, episode 29. Keep your place, move between servers, and stay ready for the next episode.
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The Greatest Advance Since the Wheel?
Sixty years ago a Dutch scientist discovered a phenomenon that overturned the electrical rule book. By cooling certain metals to incredibly low temperatures he found they could continue to carry an electric current for ever, even when the power supply was switched off. Today, developments of these metals - called superconductors-have led to trains that fly, magnets that could depollute rivers and machines that promise cheaper power.
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Episode 1: A Matter of Self-Defense
Episode 2: Bird Brain - The Mystery of Bird Navigation
Episode 3: Never Too Late to Learn
Episode 4: The Great Fish Hunt
Episode 5: Pedal Power
Episode 6: The Writing on the Wall
Episode 7: Where Did the Colorado Go?
Episode 8: The Future Goes Boom
Episode 9: Fusion: The Energy Promise
Episode 10: The First Ten Years