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Streamed live on Apr 7, 2018
Grand Finale of the 10th International Physicists' Tournament
The teams of France, Switzerland and Brazil are meeting each other in the Grand Finale of the Tournament.
-Brazil discusses the realization of an acoustic black hole, out of which no sound can escape ("Sonic black hole", problem #6) -France talks about the strange sound produced by an hex nut in a balloon ("Screaming balloon", problem #9) -Switzerland explains how to construct a loudspeaker without any moving part ("Static speaker", problem #2).