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KELLY MCEVERS, HOST:

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

AUDIE CORNISH, HOST:

Eye-popping. That's the word that comes to mind when you hear how many viruses are likely hiding out around the world in animals.

"We expect there are hundreds of thousands of mammalian viruses out there," says Kevin Olival, a disease ecologist at EcoHealth Alliance, who led the study.

Really? Hundreds of thousands?

"Yes, it's likely," Olival says. "Any given mammal species is likely to have 20, 30 or even 100 viruses. When you add that up around the planet, you get a big number."

This story includes content some readers may find disturbing.

Who killed Sister Cathy Cesnik? The Baltimore nun and school teacher was murdered in 1969, and in the Netflix documentary series The Keepers, her students tell a troubling story of abuse by priests, alleged police complicity and a possible cover-up by the Catholic Church.

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