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What Is the Great Wall of China?
More than two thousand years ago, the Chinese emperor Qin Shih Huang Ti decided to build a huge wall to keep out his enemies.…
When Was the Automobile Invented?
The first self propelled "automobile" was built in 1796 by a French army officer named Nicolas Joseph Cugnot. It was a cumbersome, three-whe
How Does a Coffee Percolator Work?
Many people brew their coffee in coffee pots called percolators. Inside a coffee percolator is a hollow stem. Sitting on top of the stem…
When Did Kindergartens Start?
Kindergarten is a classroom program that consists of children ages three to seven years of age. The programs range from half days to full…
How Do Chameleons Change Color?
The chameleon is famous for changing color. Some can change from green to brown, or to red or yellow. This little lizard can change…