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Phoenix Mars Lander - 01:55 With behind-the-scenes access, NOVA scienceNOW covers the Mars lander Phoenix's thrilling descent to the martian surface and its critical early days of operations. Phoenix will dig into the permafrost to obtain samples of martian dirt and ice for analysis in onboard labs, seeking any evidence that the Red Planet might once have sustained microbial life—or perhaps still does. Brain Trauma - 14:20 Knocks to the head may seem funny in cartoons, sports replays, and YouTube videos, but even minor head injuries often lead to serious concussions. A concussion may leave no trace on a conventional MRI scan yet cause permanent memory loss, attention problems, and depression. NOVA scienceNOW investigates promising new leads in understanding this puzzling condition, which affects millions of people in the U.S., including many high-school and college athletes who suffer concussions yet are encouraged to return to the playing field. Mammoth Mystery - 26:13 In 1962, paleontologists uncovered the rarest of Ice Age fossils in the Nebraska badlands: two complete male mammoths locked in a death grip by their 12-foot-long tusks. What made them fight? And why did they die together? Following forensic clues, paleontologists determine the sex and age of the mammoths, the time of year of their deadly battle, and how their violent clash doomed them. Profile: Judah Folkman - 38:30 Dr. Judah Folkman, who died in 2008 at age 74, was a giant in the field of cancer research. He wasn't always considered a trailblazer, however. In the 1970s, when he first proposed that cancer depends critically on new blood vessel growth, or angiogenesis, other medical researchers ridiculed his ideas. But Folkman proved his theory of angiogenesis, and today it has led not just to cancer therapies but also to treatments for other diseases of abnormal blood vessel growth, such as macular degeneration. Cosmic Perspective & Happy Birthday NASA - 49:35 Turkish subtitles will be added soon. No copyright intended, all the copyrights belong to PBS NOVA. http://www.pbs.org/wgbh/nova/sciencenow/ Support PBS! http://www.shoppbs.org/family/index.jsp?categoryId=11580318&ab=NOVAscienceNOW Or donate: http://www.pbs.org/about/support-our-mission/