Our Small Planet
You can usually use Ctrl+ and Ctrl- to zoom in and out. While I'm sure you've looked at a globe before, you may not have really thought about the world we live on. So, take a good look as it spins for us below and let's really think about it. [spinningearth size=300 wrap=left color=ffffff] The first thing that may catch your eye is Australia as it comes into view. Over 22 million people live there. Right away, China comes into the picture, with a population of over 1.3 billion. If you know your geography, you'll pick out India and Saudi Arabia just as immense Africa swings ...
The Invisible Force of Magnets
Magnets are very cool. Put them together one way and they'll stick. Turn one around and they'll push apart. But did you ever really play with two strong magnets and think about it? Get two strong magnets. Some Radio Shack and hardware stores have nice ones that are about an inch wide, two inches long, and under a half-inch thick. If you find them, buy several as they'll come in handy to hold papers on the fridge! Hold a magnet in each hand and bring them together so they repel each other. Feel the way they move as you gently feel the ...
The View From Space
It's not until we get high above the Earth that we see how small and very precious our world really is. We live on the surface of the Earth, with our deepest digging and drilling only scratching the surface. There's just a thin film of air to let us breath and, at the same time, protect us from the harsh radiation of the sun and beyond. Amazing to think about. There's a lot to explore when we look from space at the Earth as a planet. This video uses time-lapse photography to give us a look at the big picture over long periods of time. ...
The Colors of the Rainbow
When light goes through glass at an angle, it spreads out into all the colors of the rainbow. You can do this easily at home yourself with a glass of water and a sunny window. In front of a window where the sun is shining, place a clear glass of water on the edge of a table. Put a sheet of white paper on the floor where the rainbow will appear. Move the glass and the paper to get the best view. As the sunlight hits the water, the light is bent downward, spreading out to make a rainbow. This is called refraction and ...
Static Electricity is Cool
This most excellent hairdo is thanks to thousands of volts of static electricity! Not to worry, it's harmless. Well, almost harmless as it can give you a pretty good good snap! :-) Did you ever get out of the car in the winter and get a shock? Yep! That's static electricity. In future posts, you'll find several great science experiments with static electricity on this site that I hope you'll try yourself. For now, try this one: Take a tissue and tear off several little bits of paper onto the table. A half-dozen will do. Now blow up a balloon and rub it on your ...
The beakers and flasks we use in chemistry always look so... cool! But they have those shapes for a reason. The tall cylinders have markings to measure exact amounts of liquid. The triangle-shaped flask allows you to hold the top and swirl the liquids together without spilling them out the top. Beakers, with their straight sides and pour spouts, are best for mixing chemicals with a glass stirring rod. Their open cup shape is good for holding a chemical reaction. Here's an experiment using a flask and beaker. It shows how color can change as the chemicals react with each other over ...
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