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For severe heart failure patients, an LVAD, or left ventricular-assist device, helps the heart pump blood. 7asmin via Wikimedia Commons hide caption

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7asmin via Wikimedia Commons

The Peregrine Fund recently released four California condors over high cliffs in Northern Arizona. In 1982, there were only 22 of these giant birds left in the wild. George Andrejko/Courtesy, Arizona Game and Fish Department hide caption

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George Andrejko/Courtesy, Arizona Game and Fish Department

The Flight Of The Condors, And Their Audience

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EPA To Dissolve Office Of Science Adviser

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State herpetologist J.D. Kleopfer says the discovery of a two-headed copperhead snake in Northern Virginia earlier this month is an "extraordinarily rare" sighting that few of his colleagues have seen. J.D. Kleopfer/Virginia Dept. of Game and Inland Fisheries hide caption

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J.D. Kleopfer/Virginia Dept. of Game and Inland Fisheries

WATCH: 'Extremely Rare' 2-Headed Snake Stuns Social Media, Charms Scientists

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Drew Philp on the TED Stage. Jasmina Tomic / TED hide caption

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Jasmina Tomic / TED

Drew Philp: How Can 'Radical Neighborliness' Help Struggling Communities?

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OluTimehin Adegbeye on the TED stage. Ryan Lash/Ryan Lash / TED hide caption

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Ryan Lash/Ryan Lash / TED

OluTimehin Adegbeye: How Can Cities Make Space For Their Most Vulnerable Residents?

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Richard Berry on the TED stage. TED hide caption

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TED

Richard Berry: How Can Cities Create Opportunities For The Homeless?

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Liz Ogbu on the TED stage. Stacie McChesney/Stacie McChesney / TED hide caption

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Stacie McChesney/Stacie McChesney / TED

Liz Ogbu: Can We Gentrify Neighborhoods While Allowing Longtime Residents To Stay?

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