An anonymous reader writes "Astronomer and gamer Scott Manley (more famous for his Kerbal Space program coverage) has created a fantastic video explaining the science behind building guns that could one day be used to launch payloads into space. It's not as easy as simply making a bigger gun, there's a whole host of unorthodox 'gun' designs which work around the limitations of garden variety propellants."
"Can't you just gesture hypnotically and make him disappear?"
"It does not work that way. RUN!"
-- Hadji on metaphyics and Mandrake in "Johnny Quest"