Featured by William Gurstelle

Make a snowball slingshot and rule your neighborhood with an icy fist
Throwing knives is growing more popular—here’s how to get started
How to build a solar microscope
Make these tiny, exploding hydrogen bubbles
How to build an hourglass watchtower
How to build a medieval crossbow
How to build a steam-powered cannon invented by Da Vinci
Build a gas-powered marshmallow shooter
Build Your Own Mini Medieval Siege Weapon
Decorate Your Desk With This DIY Personal Sky Puppet