...You can change the world.
I just want to highlight two super-cool groups I've recently discovered, both of which adhere to the same build it yourself, open source ethos.
•Copenhagen Suborbitals http://www.copenhagensuborbitals.com/
A group of Danish rocket scientists looking to put a man into space (suborbital space). Since they began in 2008, they've built and flown a large number of rockets (like this one: http://www.youtube.com/watch?v=K7YZpvs513U&feature=fvst ) + a prototype space capsule.
They recently launched an Indiegogo campaign to raise funds for their next space capsule, the Tycho Deep Space II. http://www.indiegogo.com/Tych