If you’re in London this weekend, you should know that the Wellcome Trust is sponsoring a two-day bioscience hackathon with prizes awarded for the best ideas in four categories: Open Me — collecting data on yourself and making it useful to yourself; Open Research — making biomedical data produced by professional scientists more accessible and useful to everybody; Open Data — creating apps and hardware that allow doctors to better follow what’s really happening with their patients; and the idea that is most useful to the public at large.