DIY LEGO Technic Coil Gun
A coil gun is a weapon that uses electromagnets to accelerate a metal projectile through its barrel. It’s possible to build your own, but the high-voltage electricity involved can be dangerous. Using the utmost caution, Jamie’s Brick Jams built a slightly less deadly coil gun using Technic parts, a bunch of 9-volt batteries, and some 100-volt capacitors.