In episode 204 of SciTech Now, go trackside at a Trans Am road race to learn how racers make their cars aerodynamic; Jon Schull, co-founder of e-Nable, discusses how his organization is making low-cost 3-D printed prosthetics available to children around the world; TripExpert co-founder Emily Hughes explains how the site aims to be a definitive statement of the overall quality based on professional reviews, instead of user reviews; the Financial Times investigates whether mass-market sport-related technologies can help mitigate some of the risks associated with contact sports; as the number of social media users continues to grow, some universities have incorporated the communication tool into their curriculum.