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Scalloped hammerhead sharks can dive to depths of more than 2,600 ft (800 m) to hunt for squid and other food. Gerard Soury/Getty Images hide caption

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Gerard Soury/Getty Images

Hammerhead sharks 'hold their breath' in deeper, colder waters, research shows

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A colorized electron microscope image from the National Institute of Allergy and Infectious Diseases shows a single human immunodeficiency virus budding from a human immune cell. AP hide caption

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AP

A fast-food eatery — or thermopolium — discovered at Pompeii has been completely excavated, helping to reveal some top dishes of the ancient Roman city. The site is about 18 miles southeast of Naples, Italy. Luigi Spina/Archaeological Park of Pompeii via AP hide caption

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Luigi Spina/Archaeological Park of Pompeii via AP