A year is a long time. So, long ago, people decided to divide it into shorter time periods. About five thousand years ago, the Sumerians divided the year into twelve "moons." Each moon had thirty...
Energy from the sun
Someday you may live in a house that keeps itself warm with a tankful of \"sunshine"--- even on cloudy days and chilly nights. Instead of turning on a furnace, you'll use saved-up heat from the sun. ...
IT’S DONE WITH MIRRORS
When a magnifying glass is held the right distance from a piece of paper, it brings the sun's rays together at one point---the burning point. The heat at this point is so great, it burns the paper. ...
