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PBS
Pbs Kids: Design Squad: Build: Kinetic Sculpture
Try your hand at designing and building an 18-inch tower that can support a tennis ball while a fan blows on it.
TED Talks
Ted: Ted Ed: Can You Solve the Counterfeit Coin Riddle?
You're the realm's greatest mathematician, but ever since you criticized the Emperor's tax laws, you've been locked in the dungeon. Luckily for you, one of the Emperor's governors has been convicted of paying his taxes with a counterfeit...