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This illustration picture shows a saliva collection kit for DNA testing displayed in Washington DC on December 19, 2018. - Between 2015 and 2018, sales of DNA test kits boomed in the United States and allowed websites to build a critical mass of DNA profiles. The four DNA websites that offer match services -- Ancestry, 23andMe, Family Tree DNA, My Heritage -- today have so many users that it is rare for someone not to find at least one distant relative. (Photo credit should read ERIC BARADAT/AFP via Getty Images)

23andMe slashes 14% of workforce amid slump in DNA testing market

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Scientists discovered four new species of sharks that walk

WASHINGTON, DC - JANUARY 24: Former California Governor Jerry Brown, (L) and former U.S. Secretary of Defense William Perry unveil the Doomsday Clock during The Bulletin of the Atomic Scientists news conference, on January 24, 2019 in Washington, DC. This year the Doomsday Clock remains unchanged and is set at two minutes to Midnight. (Photo by Mark Wilson/Getty Images)

What is the Doomsday Clock?

The deadly new coronavirus has reached the US. Here's how to protect yourself

Voice of a 3,000-year-old Egyptian mummy reproduced by 3-D printing a vocal tract

Some Mount Vesuvius victims suffered slowly and one victim's brain turned to glass, new research says