William Gurstelle

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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

How to build a solar microscope

Make these tiny, exploding hydrogen bubbles

Make these tiny, exploding hydrogen bubbles

How to build an hourglass watchtower

How to build an hourglass watchtower

How to build a medieval crossbow

How to build a medieval crossbow

How to build a steam-powered cannon invented by Da Vinci

How to build a steam-powered cannon invented by Da Vinci

Build a gas-powered marshmallow shooter

Build a gas-powered marshmallow shooter