... Tower.1
This important scientific experiment was only performed in XX century here, at CU Boulder, when students threw down the furniture from the 11th floor of the Gamow tower. They were too late to get in history, however, the laws of motion had been already discovered by then.
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... observationally.2
Your book says this is impossible, but it is not true.
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Nick Gnedin
1999-01-21