Can technology make people safer from threats like violent extremism, censorship and persecution? In this illuminating talk, technologist Yasmin Green details programs she's piloted at Jigsaw (a unit within Google's Alphabet Inc.) to counter radicalization and online harassment -- including a project that gives commenters real-time feedback about how their words might land, which has already increased spaces for dialogue on the internet. "If we ever thought that we could build an internet insulated from the dark side of humanity, we were wrong" Green says. "We have to throw our entire selves into building solutions that are as human as the problems they aim to solve."