When Anika Puri visited India with her family years ago, she was surprised to come across a market in Bombay filled with rows of ivory jewelry（象牙饰品） and statues. 1 , ivory trade has been illegal for more than30years, and elephant hunting has been 2 in India since the 1970s.
"I was quite 3 ," the 17-year-old recalls. "Because poaching（偷猎） is illegal, 4 it is still such a big issue?"
5 , Puri did some research and discovered a shocking 6 : Africa's forest elephant population had 7 by about 62 percent between 2002 and 2011. Years later, the numbers continued to drop. Puri, a wildlife lover, wanted to do something to help 8 the species and others that are still likely to be 9 by poaching.
Over the course of two years, Puri 10 EISa, a low-cos t product of a machine learning-driven software that 11 movement patterns in thermal infrared（热红外） videos of humans and 12 . The software is four times more 13 than the existing most advanced detection methods. ElSa uses a $250FLIR ONE Pro thermal 14 with 206 * 156 resolution（分辨率） that plugs into an off-the-shelf iPhone 6. The camera and iPhone are then 15 to a drone（无人机）, and the system 16 real-time inferences as it flies over parks as to whether 17 below are humans or elephants.
Its potential impact on society 18 her the Peggy Scripps Award for Science Communication. "19 isn't a straight line," Puri says. "It makes me resourceful. It helps me 20 a more creative thinker."
