Surgeons take a heart valve out of a donor pig at St. Anne's University Hospital on September 16, 2013 in Brno, Czech Republic.

Surgeons performed successful transplants of hearts that had stopped beating for 20 minutes.

With Lake Shasta at 26% capacity, California's largest water reservoir, feeding the Sacramento River, is at historically low levels impacting tourism on September 27, 2014, in Redding, California.

The 1934 drought was one of the most catastrophic droughts on record in North America.

Some of the candy edibles are kept in plastic cases on the wall, ready to be scanned for purchase.

A panel recommends that cannabis-laced food that is attractive to children be banned.

Google has begun testing a function that would connect users searching medical symptoms with healthcare professionals.

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It took humans 5,000 years after farming was introduced to digest milk.