AquaBounty's genetically modified salmon is seen swimming behind a much smaller wild Atlantic salmon of the same age. AquaBounty has been trying to get government approval to sell its salmon for more than a decade. Courtesy of AquaBounty Technologies hide caption

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Leonardo DaVinci noted that when trees branch, smaller branches have a precise, mathematical relationship to the branch they sprang from. iStockphoto.com hide caption

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The compact car-sized Mars Science Laboratory is due to land on the red planet on Aug. 6, 2012. It is equipped with a suite of instruments to study rocks and soils, and take other measurements. NASA/JPL-Caltech hide caption

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Flies are attracted to glycerol, a chemical in beer produced during fermentation. Understanding more about the genes responsible for taste and smell in flies could help make powerful insect repellents. iStockphoto.com hide caption

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A jury member feels a piece of duck foie gras during a contest of local producers and producers from southwestern France. BOB EDME/ASSOCIATED PRESS hide caption

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American astronomer Edwin Hubble looks through the eyepiece of the 100-inch telescope at the Mount Wilson Observatory in Los Angeles, 1937. In 1929, Hubble proposed that the more distant a galaxy is, the faster it appears to be receding from us, a concept that has become known as Hubble's law. Margaret Bourke-White/Time & Life Pictures/Getty Images hide caption

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Nicolaus Copernicus made the astounding claim that Earth revolves around the sun, not the other way around. He's seen here circa 1515. Hulton Archive/Getty Images hide caption

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Pythons' huge meals strengthen their hearts, and scientists hope it will help them learn how to treat human heart diseases.

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Adrian Beltre of the Texas Rangers is hit by a pitch from the Tampa Bay Rays' James Shields on Oct. 1 at Rangers Ballpark in Arlington, Texas.

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The Stratospheric Observatory for Infrared Astronomy, known as SOFIA, is a modified Boeing 747 airplane that houses a NASA telescope. Melissa Forsyth/NPR hide caption

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