Vice President Biden and Turkish Prime Minister Binali Yildirim hold a news conference after meeting Aug. 24 in Ankara, Turkey. While the U.S. and Turkey are close allies, they've been at odds on a number of issues, and the meeting was designed to improve the atmosphere. Adem Altan/AFP/Getty Images hide caption

Mylan, the maker of EpiPen, says it will sell a generic version for $300 for a two-pack, a price that consumer advocates say is still too high. The device is used to treat severe allergic reactions. Daniel Acker/Bloomberg via Getty Images hide caption

Bacteriophages, in red, look like tiny aliens, with big heads and skinny bodies. They use their "legs" to stick to and infect a bacterial cell, in blue. Biophoto Associates/Science Source hide caption

Artist Noah Davis founded The Underground Museum to bring world-class art to a neighborhood in Los Angeles — for free. He was just 32 years old when he died from cancer in 2015. Ed Templeton/The Underground Museum hide caption

Officials found the toxin microcystin in the blue-green algae present at Discovery Bay, Calif. For people exposed to the toxin, symptoms include dizziness, rashes, fever, vomiting and in more unusual cases, numbness. Lesley McClurg/KQED hide caption

When a person places a finger in the slot on the left, the robot uses an algorithm — unpredictable even to its creator — to decide whether to prick the finger with the pin on the end of its arm. Alexander Reben hide caption