>>>>I was an industrial arts teacher in the late 1970's.
>>>>
>>>>And I almost flunked wood shop because I broke some equipment :)
>>>
>>>We built really cool cannons in metal shop. That got stopped after someone unnamed fired a 1/2 inch ball bearing through a fire door into a concrete wall.
>>
>>Kid in my high school shop class built a beautiful sleek crossbow. Try that today and you end up in a ward somewhere.
>
>I remember a kid made a crossbow in auto shop class - used leaf springs from a pickup and a come along winch. Had a bipod because it was so heavy. Big ugly thing. I never heard if he actually used it.

He could probably use it to shoot down satellites :) He sounds like the kind of guy DARPA would be interested in, if he isn't working for them already.