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Working Like a Dog
Dogs make fantastic pets. But many dogs do much more than chase sticks and take walks. Learn about some canines that really work their tails off.


	THE BEAT GOES ON Your heart beats 100,000 times a day. Each beat gives your body the oxygen it needs to survive. But what happens when the heart’s not up to the job? The article on page 4 of our January-February issue tells you the stories of some courageous kids. They overcame their heart problems with the help of science. Explore More Catherine Stephens, The Human Machine (National Geographic Reading Expeditions, 2002) Peter Winkler, Keeping Fit (National Geographic Reading Expeditions, 2002) >> Quick Flicks: Heart Just in time for Valentine's Day! This cartoon explains one of your hardest-working organs—the heart. >> KidsHealth: All About the Heart Learn how your heart works and how to keep it healthy. >> PBS: Cut to the Heart Get straight to the heart of the matter—with a map of the human heart.


	EYEWITNESS ON THE UNDERGROUND RAILROAD William Still was a brave man who helped about 800 slaves escape north to freedom. He also listened to their stories and wrote them down. These true tales of courage are inspirational to this day. Learn more about Still and read some runaway slaves' stories on page 12 of our January-February issue. Explore More Gina K. Gorrell, North Star to Freedom (Delacorte Press, 1996) Jim Haskins, Get on Board: The Story of the Underground Railroad (Scholastic, 1993) Ann Petry, Harriet Tubman: Conductor on the Undeground Railroad (Harper Trophy, 1996) Ann Rossi, Anti-Slavery Movement (National Geographic Reading Expeditions, 2003) >> Online Adventure: The Underground Railroad For runaway slaves, the road to freedom was full of great danger and difficult decisions. Get on board and start the journey. >> National Underground Railroad Freedom Center This new museum will open in 2004. Meanwhile, you can add your own messages of freedom to its site. >> William Still: Father of the "Railroad" Learn more about the man who wrote down the escape stories in the article.