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Nigerians turned out in large numbers to select their next president, a contest between incumbent Goodluck Jonathan and his rival, former military dictator Muhammadu Buhari.

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Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

In spring, West Bank almond trees bloom white. Dry brown hills turn temporarily green and are dotted with bright wildflowers. The ewes and nanny goats of Bedouin herders that wander the West Bank eat well this time of year.

It's cheese season.

Shane Avery practices family medicine in Scott County, Ind. In December, a patient came to his office who was pregnant, and an injection drug user.

After running some routine tests, Avery found out that she was positive for HIV. She was the second case he had seen in just a few weeks.

"Right then, I kind of realized, 'Wow, are we on the tip of something?' " Avery says. "But you just put it away. ... It's statistically an oddity when you're just one little doctor, you know?"

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

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