FEaTURES_03.15 FEaTURES_01.13 39 EnginEEring hEroEs 2015 These six exceptional engineers stand out for their creativity, courage, and commitment to improving the lives of others. 32 50 The Internet of Trees A web of sensors scrutinizes the Harvard Forest for clues to climate change. by Mark harris Can You Trust the Internet of Things? We're connecting everything to the Internet-it's time to fix the security flaws. by alan grau on the Cover photograph for IEEE Spectrum by Dan burn-Forti photograph by Gabriela Hasbun SPECTRUM.IEEE.ORG | nORTh aMERICan | MaR 2015 | 01http://SPECTRUM.IEEE.ORG