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• In 1991, four men and four women began a two-year stay inside a sealed-off structure in Oracle, Ariz., called Biosphere 2. They emerged from the structure on this date in 1993.
• Ten years ago: President George W. Bush and Russian President Vladimir Putin (POO'-tihn) opened a two-day summit at Camp David. The government issued a recall for Segway scooters, citing instances in which riders fell off when the batter

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