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Thursday

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

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

Animals

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

Sharks are ectotherms and their internal body temperatures usually reflect the waters they swim in. Holding their breath helps them function in the frigid deep.

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

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Thursday

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Friday

Discovery of HIV variant shows virus can evolve to be more severe — and contagious

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

Goats and Soda

Discovery of HIV variant shows virus can evolve to be more severe — and contagious

Findings from a new study help answer questions about why some people get more severe and transmissible HIV than others — and serve as a reminder that viruses don't always weaken over time.

Sunday

What's On The Menu In Ancient Pompeii? Duck, Goat, Snail, Researchers Say

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

Europe

What's On The Menu In Ancient Pompeii? Duck, Goat, Snail, Researchers Say

For the first time, a food stall has been excavated in its entirety in the city. The stall had remnants of 2,000-year-old food — giving researchers a glimpse into Pompeii street food.