The premise of this summer's Disney/Pixar hit movie "Up" is that an old guy named Carl ties thousands of helium balloons to his house. The balloons rip the house from its foundation and whisk Carl and a young stowaway off on a grand adventure in South America.

We saw it and thought, what a great movie. Other people saw it and thought, could you really do this? And if so, how many balloons would it take?

The people at Wired magazine's "Wired Science" blog reck ...

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