"My brain used to be my best friend," says Greg O'Brien, a journalist with early onset Alzheimer's. But he can't trust it anymore, he says. Alzheimer's is, in some ways, changing who he is. Amanda Kowalski and Samantha Broun for NPR hide caption

itoggle caption Amanda Kowalski and Samantha Broun for NPR

Amy and Dave Freeman paddle into the Boundary Waters, starting their 365 days in the wilderness to raise awareness of mining plans in the region. Alex Chocholousek hide caption

itoggle caption Alex Chocholousek

Using an instrument they've named the HOLODEC, for Holographic Detector for Clouds, scientists can now see in fine detail the way air and water droplets mix at a cloud's wispiest edge. iStockphoto hide caption

itoggle caption iStockphoto
James Duncan Davidson/TED

A team of blacksmiths, welders, artists and scientists have been working together in Canada to mount the T. rex bones without damaging them. Metal cradles hold 150 of the major bones precisely in place. Research Casting International hide caption

itoggle caption Research Casting International

Matt Damon portrays an astronaut who relies on science to survive on a hostile planet. Giles Keyte/EPKTV hide caption

itoggle caption Giles Keyte/EPKTV