The Central and Peripheral Nervous SystemsAnatomy and PhysiologyThe Central and Peripheral Nervous SystemsYou've Got Some Nerve!Gyri and SulciThe Control CenterSensory and Motor ControlThalamus: The…
Born: 12/29/1808Birthplace: Raleigh, N.C. Andrew Johnson was born at Raleigh, N.C., on Dec. 29, 1808. Self-educated, he became a tailor in Greeneville, Tenn., but soon went into politics, where he…
PARTS OF THE SYSTEM HEART BLOOD VESSELS BLOOD FIND OUT MORE
The circulatory system is centred on the HEART, a muscular organ that rhythmically pumps BLOOD around a complex network of…
—by Eleanor MayfieldSource: The U.S. Food and Drug Administration Once upon a time, we didn't know anything about fat except that it made foods tastier. We cooked our food in lard or shortening. We…
Flames, doves, oaths, and more Closing ceremonies in Nagano, Japan. Related Links 2014 Winter OlympicsMemorable Olympic MomentsBirth of the Modern OlympicsEncyclopedia:…
WHAT IS AN ELECTRIC SIGNAL? WHAT ARE ELECTRONIC COMPONENTS? WHAT IS A TRANSISTOR? SEMICONDUCTORSFIND OUT MOREElectronic circuits operate nearly every modern machine—microwave ovens, cars, and…
DECIBEL SCALEROCK MUSICNOISE CANCELLINGFIND OUT MORESome sounds are so loud they are painful to our ears; others are so quiet they may be hard to hear at all. Things that vibrate a lot, such as…
