Greg O'Brien gathers his thoughts before a run in 2013. "Running is essential," he says. Michael Strong/Living With Alzheimers hide caption

itoggle caption Michael Strong/Living With Alzheimers

Students Patrick Rohrer, Sarah Warthen, Alix Piven and Lauren Urane are led by Mercyhurst University Archeologist Andy Hemmings. Their project has picked up where Florida's State Geologist Elias Sellards left off in 1915. Sellards led an excavation of the site where workers digging a drainage canal found fossilized human remains. Greg Allen/NPR hide caption

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A field of unharvested wheat is seen in Ashby-de-la-Zouch, England, in 2012. Wheat wasn't cultivated in Britain until some 6,000 years ago, but DNA evidence suggests early Britons were eating the grain at least 8,000 years ago. Darren Staples/Reuters/Landov hide caption

itoggle caption Darren Staples/Reuters/Landov

With the technology to conduct more nuanced tests, some companies say they can provide more useful detail about how people think in dynamic situations. Marcus Butt/Getty Images/Ikon Images hide caption

itoggle caption Marcus Butt/Getty Images/Ikon Images

"Although we human adults are really good at understanding other minds, we weren't always that way." - Rebecca Saxe James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED

"Once I awoke...I could not walk, talk, read, write; I could not recall any of the details of my life. Jill Bolte-Taylor died that day." - Jill Bolte-Taylor Andrew Heavens/TED hide caption

itoggle caption Andrew Heavens/TED

"Human cognitive science and cognitive neuroscience are starting to give us an answer to...who we are as thinkers." - Nancy Kanwisher James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED

"Understanding consciousness is a real key, I think, both to understanding the universe and to understanding ourselves." - David Chalmers James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED

The size of the brain of a chimpanzee (right) is considerably smaller than that of a human brain. Probably multiple stretches of DNA help determine that, geneticists say. Science Photo Library/Corbis hide caption

itoggle caption Science Photo Library/Corbis

A slice of pork belly, with a thick layer of fat. "If we confirm that fat is a basic taste quality, it's the equivalent of saying chartreuse is a primary color," Richard Mattes of Purdue University says. "It changes our basic understanding of what taste is." Xiao He/Flickr hide caption

itoggle caption Xiao He/Flickr

Robert Davies (standing) and the quartet during a performance of "The Crossroads Project." Musicians include (left to right) Robert Waters, Rebecca McFaul, Anne Francis Bayless and Bradley Ottesen. Andrew McCallister /Courtesy of The Crossroads Project hide caption

itoggle caption Andrew McCallister /Courtesy of The Crossroads Project