It was on this date in 1991 that four men and four women entered the huge, airtight greenhouse Biosphere II in Arizona. The idea was for them to be self-sustaining, growing their own food and recycled air and water -- with no outside help -- for two years. While that was the goal, in actuality, it was later revealed that oxygen had to be pumped in after levels within the Biosphere dropped dangerously low. The eight "bio-nauts" emerged again on this date in 1993.
The shuttle Atlantis returned to Earth on this date in 1996, bringing with it astronaut Shannon Lucid. Her six-month tour -- 188 days, to be exact -- aboard the Russian Mir space station set a world record for a woman in space, as well as a record stay in orbit for any American astronaut.
The double murder trial of football legend O.J. Simpson opened on this date in 1994 in a Los Angeles courtroom. The athlete-turned-actor was accused of killing his ex-wife and her friend. While Simpson would be acquitted of criminal charges in Oct. 1995, a civil jury would later find him liable in the deaths -- and order him to pay more than $33 million.
British troops occupied Philadelphia on this date in 1777, during the Revolutionary War. They didn't stay.
On this date in 1950, U.N. troops took the South Korean capital of Seoul from North Korean forces.
The Motion Picture Association of America, under pressure from legitimate filmmakers, adopted the "NC-17" rating -- no children under 17 allowed -- on this date in 1990. "NC-17" replaced the "X" rating that had been exploited by the porn industry.
And the longest winning streak in sports -- 132 years -- ended on this date in 1983, when the yacht Australia II won the America's Cup from the United States.
We now return you to the present, already in progress.
Notable deaths of 2014 [PHOTOS]