> What's in a sand castle? Millions and millions of tiny grains of sand. The many grains of sand are packed together to make a single shape---a castle with towers, walls, and bridges. And what...
What’s the Matter?
What's the matter, do you ask? I'll tell you right away. It's everything around you, as you work, or sleep, or play. A chair is matter, a table, too, and so is a rock or tree. A cloud, a star, a...
“Something” for everyone
What's in the package? You won't know for sure until you open it---but it's fun to guess. You can tell about how big the present inside the wrapping paper is. And you can tell about how heavy it...
What’s the Matter?
What’s the Matter? What’s the Matter?
Putting machines to work
Turn the key at the back of the alarm clock once . . . twice . . . three times. At first the key turns easily. But as you keep winding, the key turns harder and harder. Finally the clock is wound as...
The moving stairs
> Here I stood on the floor below, Then on a stair-step rising slow. > > Over the heads of the shoppers then--- Dressed-up ladies and bothered > men; > § > > An escalator that carries you from...
Machines from machines
It's easy to see how a pair of scissors works. Every time you squeeze the handles together, the blades cut into the paper. Using a pair of scissors is simple---but scissors are not a simple machine....
Finding out about gears
Materials - cardboard box - corrugated packing paper - marker - pins (3 long) - plastic lids (1 small, 2 large) • white glue What special things can gears do? Here is a project that will help...
Wheels with teeth
Why should a wheel have teeth? Wheels don't eat! But some wheels use teeth to get a lot of work done---and they can do things that other wheels can't do. > A wheel with teeth is called a gear....
The Tree House
by Johann Wyss We soon found four large casks, made of sound wood and strongly bound with iron hoops. These were floating with other things in the water in the hold. We managed to fish them out and...