4. How to build a nuclear reactor at home. Sounds crazy but it's being done by dozens of enthusiasts... and a video from BBC (extreme DYI)
5. Build Your Own Weather Satellite http://weather.about.com/b/2009/05/02/build-your-own-weather-satellite.htm
i didn't read the article but according to current rules 25K is min. for day trading ...so.. it should be 30K to start hft