Mr. Wizard's World

Steam Breaks Container, Navel Orange, Fresnel Lens, Balloon Rocket, North Pole, Sea Turtles and more (3x11)

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Steam Breaks Container, Navel Oranges, Fresnel Lens, Balloon Rocket, How Many North Poles, Computer Trivia, Sea Turtles, Ultraviolet Light Detection. Christian explains how pressure is built up inside a pressure cooker. Mr. Wizard blows up a balloon by placing it on top and they watch it expand as steam flows into it.