When ancient Egyptians made mummies, they took all the internal organs out of the body except the heart, which they believed was the seat of intelligence. Later, people came to see the heart as a symbol of love. But doctors know of the heart as a tireless worker that beats more than 2 1/2 billion times without resting in the average lifetime. This is only one of the amazing things our body does. Want a quick way to get to these great sites? Use the direct links on The Times Launch Point Web site. http://www.latimes.com/launchpoint/
Science Fact File: Seven systems of the body are illustrated, including the skeletal system and the nervous system. Brief facts and well-labeled pictures describe each system.
The Parts of the Body: Learn where various parts of the body are and what they are called in English and Japanese.
Bill Nye Episode Guides--Life Science Search: Use the Life Science archive of the TV series to find facts and experiments on a variety of anatomy topics.
Knowledge Adventure Encyclopedia--The Human Body: More than 150 quick descriptions on items related to human biology.
My Health Informative: Articles for kids and teenagers on a range of topics including the brain, ear, eye, heart and kidneys. Also includes a glossary of medical terms.
The Human Heart--A Living Pump: Learn about the heart and how it works by reading descriptions, a labeled diagram and glossary.
Cells Alive! Photos and movies show the activities of different types of cells. Learn how living cells "keep in shape" and about the bacteria that cause stomach ulcers.
The Heart--An Online Exploration: An in-depth look at the heart, its inner workings and its symbolism. Includes some photographs of the human heart, healthy heart advice, quizzes and a short video of coronary bypass surgery.
Humans in Space: Explains how the different systems of the body work and how the weightlessness of space affects them. Includes diagrams and online quizzes.
Launch Point is produced by the UC Irvine Department of Education, which reviews each site for appropriateness and quality. Even so, parents should supervise their children's use of the Internet. This week's column was designed by Anna Manring and Stan Woo-Sam with contributions by Gayle Route.
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The answer to this Internet quiz can be found in the sites at right.
About how many breaths do you take each day?
Clue: See Bill Nye Episode Guides--Life Science Search.
How It Works: Answer the questions correctly in four Explorer's Quest Web Challenges by today and you'll get a free T-shirt. Just clip and fill out the form on Page B5, or make up your own handwritten form. You also can find the form on the Times Launch Point Web site, http://www.latimes.com/launchpoint/ See next week's Quest for the start of a new contest.
Answer to last week's Quest: The richer and more successful California missions had large, extravagant main fountains.