[Jeff Rodriguez] has been busy testing a feasible DIY method for rifling a barrel and has found some success using salt water, a power supply, wire, and 3D printed parts to create the grooves of ...

1498 - Rifling principle is discovered. 1509 - Invention of wheel lock (rose lock). The next major advance, the wheel lock, generates a spark mechanically. With no wick to keep lit, the wheel lock ...

And by taking the time to organize your most important items now, you'll avoid "rifling through drawers" during a disaster and ensure you're prepared to act quickly in an emergency, she says.