The Smithsonian is sharing images of astronaut graffiti aboard the Apollo 11 command module, including this tribute to the spacecraft. Smithsonian Air and Space Museum hide caption

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A reconstruction of a Neanderthal man (right) based on skull found at the La Ferrassie rock shelter in Dordogne Valley, France. He's face to face with a male Homo sapien. Philippe Plailly & Atelier Daynes/Science Source hide caption

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"We are very different from all previous species, and we have the power to endure. We also have the power to destroy ourselves." — Lord Martin Rees Ryan Lash/TED hide caption

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TED Radio Hour

Lord Martin Rees: How Can We Ensure Our Survival As A Species?

Astronomer and cosmologist Lord Martin Rees asks whether our species will endure despite the many existential threats we face.

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Russ Finch holds up half of a Cara Cara orange grown in his geothermal greenhouse in Alliance, Neb. Courtesy of Grant Gerlock/Harvest Public Media hide caption

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A simulation shows gravitational waves coming from two black holes as they spiral in together. S. Ossokine , A. Buonanno (MPI for Gravitational Physics)/W. Benger (Airborne Hydro Mapping GmbH) hide caption

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Green when young, and about the size of an adult human's hand when full-grown, Dryococelus australis is more commonly known as the Lord Howe Island stick insect, or the tree lobster. Courtesy of Rohan Cleave/Melbourne Zoo hide caption

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A neighborhood where many people have left their homes because of a massive natural-gas leak is seen in the Porter Ranch neighborhood of Los Angeles in December. David McNew/AFP/Getty Images hide caption

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Wisdom, a Laysan albatross that's believed to be 65 years old, and her mate have welcomed a new chick at the Midway Atoll National Wildlife Refuge. Here, a week-old chick peeks out from its nest. Kaipo Kiaha/Paliku Productions hide caption

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A central piece of President Obama's climate change initiatives is now on hold, after the Supreme Court put a stay on rules limiting carbon pollution generated by U.S. power plants. Charlie Riedel/AP hide caption

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While some scientists seek ways to stop the spread of Zika by mosquitoes, others have received new funding from the National Institutes of Health to track the genes and habits of the virus itself. Felipe Dana/AP hide caption

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The totoaba is prized for its large bladder. Richard Herrmann/Minden Pictu via Corbis hide caption

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Goats and Soda

Chinese Taste For Fish Bladder Threatens Tiny Porpoise In Mexico

The nets that ensnare the giant totoaba fish also trap and kill the world's smallest and rarest mammal: a porpoise called the vaquita.

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Emotion seemed to fuel plenty of sighs by Humphrey Bogart's character Rick (right) in the 1942 film classic Casablanca, and even Rick's good friend Sam, played by actor Dooley Wilson, couldn't console him. Archive Photos/Getty Images hide caption

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Divers around the open-ocean aquaculture cage at the Cape Eleuthera Institute in the Bahamas. These cages are not currently used in the Gulf of Mexico, but represent one type of farming technology that could work in the region. NOAA/with permission from Kelly Martin hide caption

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