Horizon - Season 38 (2001)

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It seems the speculation wasn't absurd enough. Parallel universes really do exist and they are much stranger than even the science fiction writers dared to imagine.

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The extraordinary saga of a document lost for hundreds of years, that could have changed the course of history.

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Near a small lake in West Africa, hundreds of people and animals are found dead from asphyxiation. Scientists must find out what happened in order to prevent it happening again.

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