Wall-E fell in love with another robot in the movie named after him. Researchers have yet to create a sentient machine, but a breakthrough could be on the horizon. John M. Heller/Getty Images hide caption

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John M. Heller/Getty Images

According to recent reports from a research team led by Australian biologist Monica Gagliano, some plants such as chili peppers may be able to "hear" other plants. iStockphoto.com hide caption

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iStockphoto.com

A capuchin monkey riding a dog. Tim Lepard, owner and creator of the Monkey Rodeo, says his animals are treated humanely. Courtesy of Tim Lepard hide caption

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Courtesy of Tim Lepard

Whatever you think about the candidates, we can all agree both have been punching bags for their opponents. Chris O'Meara/AP hide caption

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Chris O'Meara/AP

Fans wear President Obama and Mitt Romney masks at the Atlanta Braves-Miami Marlins game Sept. 25 in Atlanta. One of many quirky election year predictors is based on which candidate's likeness sells better as a Halloween mask. David Goldman/AP hide caption

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David Goldman/AP

Students wait in line to vote last Friday on the campus of the University of Northern Iowa in Cedar Falls, a day after the swing state began in-person early voting. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images

Then-Sen. Barack Obama gets makeup applied at a presidential candidate forum in Lake Forest, Calif., on Aug. 16, 2008. Alex Brandon/AP hide caption

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Alex Brandon/AP

President Obama laughs as comedian Jimmy Kimmel gives his monologue during the White House Correspondents Association Dinner in Washington, D.C., on April 28. Saul Loeb/AFP/Getty Images hide caption

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Saul Loeb/AFP/Getty Images

President George W. Bush dances with members of the KanKouran West African Dance Company during a Rose Garden event to mark Malaria Awareness Day at the White House on April 25, 2007. Alex Wong/Getty Images hide caption

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Alex Wong/Getty Images

Sen. Joe Lieberman appears at the Republican National Convention in St. Paul, Minn., in 2008, just eight years after he was the Democratic vice presidential nominee. His appearance is just one of several notable oddities at recent political conventions. Charles Rex Arbogast/AP hide caption

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Charles Rex Arbogast/AP

Staff Sgt. Jesse Parker (left) and Airman 1st Class Alisha Burns, 644th Combat Communications Squadron, work together to paint the Daniel L. Perez Elementary School. Sr. Airman Benjamin Wiseman/Courtesy of U.S. Air Force hide caption

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Sr. Airman Benjamin Wiseman/Courtesy of U.S. Air Force