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De Mammoetgrot of the Mammoth Cave is de plaats waar onderzoek gedaan door Kleitman werd naar het slaapgedrag van de mens en of we beïnvloed worden door een 24 uren cyclus van een dag. 32 dagen lang brachten men door in de Mammoth Cave. Het Mammoth Cave Hotel meubileerde de grot.
De grot is ook opgenomen door UNESCO als World Heritage Site .
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