A super-fast, super-cool car that uses the pent-up energy inside a mouse trap spring to propel a homemade car forward. While normally this is reserved for high school physics classes, it really is a fun and inexpensive experiment to do with kids of all ages. This is a...

This is REALLY easy to build. SUPER cool to watch (though most adults can't figure out how it works until you tell them). And it teaches one of the MOST IMPORTANT concepts there is in science. Guaranteed to keep small kids and cats busy for hours 🙂 Here's what you...

These homemade pulleys work great as long as they glide freely over the coat hanger wire (meaning that if you give them a spin, they keep spinning for a few more seconds). You can adjust the amount of friction in the pulley by adjusting the where the metal wire bends...

This is a satisfyingly simple activity with surprising results. Take a tennis ball and place it on top of a basketball… then release both at the same time. Instant ball launcher! One of the basic laws of the universe is the conservation of momentum. When objects smack...

You can install One Way Mirrors (most tinted windows can be converted into a one-way mirror) in your house by hanging one in a hallway and cover up the background with a thick blanket or sheet. This is very similar to the “Haunted Mansion Mirrors” effect at...

Imagine a plate of spaghetti. The noodles slide around and don’t clump together, just like the long chains of molecules (called polymers) that make up slime. They slide around without getting tangled up. The pasta by itself (fresh from the boiling water) doesn’t hold...

When trick-or-treaters answer your door, quickly turn off the inside lights, open the door, set off your Real Bats that Fly! Here’s how to make bats: Fire up the strobes when releasing your bats for a completely disorienting effect that will leave most people...

Hang Starch Ghosts from a slow-moving fan for a spooky and fun effect! It looks like they are simply floating around by themselves with nothing holding up their shape. Here’s what you do:

Today we're going to bend light to make objects disappear! When a beam of light hits a different substance (like glass), the speed of light changes. The color of the light (called the wavelength) can also change. In some cases, the change of wavelength turns into a...

Note that these speakers are made from cheap materials and are for demonstration purposes only… they do not have an amplifier, so you’ll need to place your ear close to the speaker to detect the sound. DO NOT connect these speakers up to your iPOD or other expensive...