Not all nanoparticle solutions are created equal. Teen scientist Katie Lu has discovered a way to reduce nanoparticle toxicity by changing their shape. Katie Lu has been an Intel International Science and Engineering Fair Finalist in Environmental Sciences, Regeneron Science Talent Search Top 300 Semifinalist, FBLA National Champion in Financial Math, HOSA International Finalist in Biomedical Debate, and NOAA Taking the Pulse of the Planet Award. Her passions include promoting transparency, ethics in science companies, environmental nanotechnology in big business, and the creation and enforcement of regulations on nanotechnology in consumer projects. This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at https://www.ted.com/tedx