Sebastiaan De Vos, right, the general manager of Vienna's Magdas Hotel, recruits refugees like 24-year-old Ehsan Amini, left, to work at the hotel. Amini, who works in the Magdas cafe, fled Afghanistan and arrived in Austria five years ago. He's one of 20 refugees staffing the hotel. Joanna Kakissis for NPR hide caption

toggle caption Joanna Kakissis for NPR

Brooke Borel says bedbugs were essentially wiped out after World War II thanks to DDT. It's not totally clear why they came back in the past couple of decades. iStockphoto hide caption

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Kelsey Blodget of Oyster.com photographs the lobby of New York's Trump SoHo hotel. The website relies on tech-savvy workers to create online reviews and track hotel bookings. Oyster.com hide caption

toggle caption Oyster.com