recursion

Bill Gurstelle wrote to tell me about his new book, Whoosh Boom Splat (Amazon), which tells you how to make awesomely dangerous projectile toys at home. But I'll let his video do the talking:

(Remember, kids, always wear your safety glasses!)

Bill's one of those guys that it's cool to have in your area. I found his blog Notes from the Technology Underground when I was scouting around for Central Standard Tech. He's also written for techie mags like Wired and Make.