Hardly a day passes without a new technology ethics scandal in the news — from privacy violations on social media to biased algorithms to controversial data collection practices. In computing practice and research, good intentions sometimes still lead to negative consequences. So what can we do as technologists, researchers, and educators? This talk describes three lessons from my research that inform ethical practices in studying, building, and teaching about technology: (1) remembering the humans present in data, towards ethical research practices; (2) unpacking ethical debt (as a parallel to technical debt) in technology design and research as the precursor to the types of unintended consequences that underly many controversies; and (3) a broader perspective on computing education that puts thoughtful critique of technology in everyone’s hands.