Cut the sides of the small cup into four equal parts. Remove the base to create four curved pieces that will be the blades of the wind generator. Use hot glue to attach two craft sticks together at ...

A rotating black-and-white disk produces the illusion of color. Rotate this black-and-white pattern at the right speed, and the pattern appears to contain colored rings. You see color because ...

Make a simple mini-motor. A coil of wire becomes an electromagnet when current passes through it. The electromagnet interacts with a permanent magnet, causing the coil to spin. Voilà! You’ve created ...

Create your own personal sound system with a coat hanger and string. Create your own personal sound system with a coat hanger and a string, producing musical sounds that only you can hear Cut two ...

See yourself as others see you in this cylindrical mirror. A flat mirror will always reflect an image that's right side up and reversed right to left. A cylindrical mirror can produce images that are ...

The distribution of the mass of an object determines the position of its center of gravity, its angular momentum, and your ability to balance it. Place a lump of clay about the size of your fist ...

You’ve probably seen an ice skater spinning on the tip of one skate suddenly start to spin dramatically faster. A diver or gymnast may also suddenly flip or twist much faster. This speeded-up rotation ...

The pneumatic tire and the chain drive, followed by the development of gears, revolutionized bicycling in the later 1800s. In the last fifteen years, there has been a revolution of sorts in the ...

Rules for Tic-Tac-Toe The game is played on a grid that's 3 squares by 3 squares. You are X , your friend (or the computer in this case) is O .Players take turns putting their marks in empty squares.

One of the most exciting exercises I ever did as a kid was to make a scale model of the Solar System. Most of the pictures in my books made the distance between planets seem small and easy to travel.

Global Climate Change Explorer Keeping an Eye on Our Changing Planet Scientists have been studying the relationship between global climate and carbon in the atmosphere for over a century, with a ...

Yeast also produces alcohol as it feeds, which is why it is an important ingredient in making beer. In 1857, Louis Pasteur discovered that yeast is a living organism whose activity causes fermentation ...