I've been working on cs50-web, an offshoot of cs50; Harvard's introduction to computer science. The community is pretty big, as it contains all the people taking cs50 and it's offshoots. I find the course to be very well put together and find the lectures more broad and interesting than the ones at my uni.
When are people gonna start talking about the elephant in the room? There is no publicly available data that points to reusable rockets being safe for human return.