Zoo visitors look at protesters and mourners from a walk bridge during a vigil for the gorilla Harambe outside the Cincinnati Zoo & Botanical Garden. John Minchillo/AP hide caption

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John Minchillo/AP

If Gorilla's Death Moves You, Consider Other Animals' Plights

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Author Barry Estabrook says pigs can be taught to play computer games and recognize themselves in a mirror. W. W. Norton & Company hide caption

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W. W. Norton & Company

'Tales' Of Pig Intelligence, Factory Farming And Humane Bacon

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Not all cows get to spend their days with soft green grass under hoof. For many, the picture isn't so pretty, according to the book Farmageddon. Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images

The drone in Potter's promotional video on Kickstarter. "Now I'm looking at other models (and a second drone) because some people have threatened to shoot it down," Potter says. via Kickstarter hide caption

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via Kickstarter