On September 21, 2001, admission to the Denver Museum of Nature and Science was free, as it celebrated the International Biodiversity Observation Year (IBOY). Scientists from Colorado State University's Natural Resource Ecology Laboratory (NREL) were at the museum to help celebrate the IBOY. Using interactive displays and demonstrations, NREL's scientists and students working on ecosystems ranging from Colorado lakes and prairies to African Savannahs and Antarctic deserts were on hand to explain how state of the art science is being used to help understand biodiversity. Visitors to the Free Day were able to compare NREL's contemporary biodiversity research with historical biodiversity research featured in the visiting exhibition "Voyages of Discovery." Members of the IBOY Secretariat, housed at NREL, were there to answer general questions about biodiversity and the IBOY.

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