The Latest on Mad Science

There is something special about a secret knock. It gets you into secret super villain meetings and is a surefire way to test for rotating bookcase passages. Secret knocks usually work with an intimidating drug lord and for policeman listening at the door for the correct pattern of raps.

As you read in the heading this is simple compressed air cannon which you can build with PVC pipes from your local hardware store for a couple of bucks.

In this video i wanted to show how the railway signal works. Sorry for a poor quality, this is my first video on youtube. Interesting thing. When train is approaching to the road crossing, signal immediately turns on. The secret is that there is a signal coming through the rails, and when train is near, it close this signal and siren starting work.

In theory an egg shell works similar to the enamel found on your teeth. Grab a can of Coke, an empty jar, and one delicate egg. Place the egg within the jar and pour the coke over the egg. Store the jar in a safe place for one day. Once twenty four hours have passed, open the jar and pour the soda into a bowl slowly, leaving the egg in the jar. Gently remove the egg from the jar and examine what the soda has done to the shell. Remember the egg represents the enamel on your teeth!

In this experiment, you will need a single egg, thongs, a lighter, and a cup filled with water. Grab the egg with the thongs. Now with the lighter, start burning the egg to create soot all around the egg. You will end up with a black egg. Grab the cup filled with water and gently place the black egg into the water. You went from a white egg, to a black egg, to the end result of a silver egg!

Setup: Grab a matchbox and a small coin. Sandwich the coin between the insert and the cover.

In this experiment we used lots of short ball chains and connected them all. *Note - if you don't have tons of ball chains, you can use Rigatoni pasta and pass a rope through them connecting them all. You can even color them different colors for an added effect too!

Are the kids bored? Need something for a school project? Want a great activity for a family night? In this tutorial I am going to show you how to make slime! This easy slime recipe only requires 3 basic everyday household ingredients, with an optional 1 or 2 more ingredients. The slime is non-toxic and super safe to play with. Don't eat it though! So let's get to it, let's make some slime!

So these LEDs glow in an orange. HOW?

In order to be considered alive, an object must have these traits.

I want to know about making duplicate rice puller coin

Don't want to waste your money buying #

4th-6th graders enhance their study of ancient China using WonderHowTo's spice rack gunpowder experiment.

I need to make a lightness detector circuit on fritzing but I don't k now how to make it. Can you Please help me?

Why can't Thanksgiving be a celebration of fireworks, too?

How to make metal pull and fragile(convert it to powder) the rice grains?