In this March 27, 2017 photo, Elizabeth Brenner, third right, and her family sit at the spot on the Milam Glacier Trail where Brenner's son, Thomas Plotkin, slipped and fell more than 300 feet down a steep gorge and into the raging Goriganga river in 2011. Plotkin, a University of Iowa student at the time, was on an outdoor learning study abroad trip to India, and was on his way out of the mountains in north India when he fell. His body was never found. Hundreds of thousands of American students study abroad each year, but no one can say exactly how many are injured or die. (AP Photo/Rishabh R. Jain)
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