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link See hyperlink. Linux A UNIX®-like, open-source operating system developed primarily by Linus Torvalds. Linux is free and runs on many platforms, including both PCs and Macintoshes. Linux is…

How fast could dinosaurs walk or run?

Estimates of dinosaur speeds vary because several different methods are used to calculate them. One recent estimate suggests that an average person might have been able to to outrun an adult…

Ellen Dorrit Hoffleit Biography

scientistDied: April 9, 2007 (New Haven, Connecticut) Best Known as: astromoner and author of "The Bright Star Catalogue" Astromer who compiled "The Bright Star…

How Much Paper in One Tree

The Question: How many pieces of paper will one tree make? The Answer: Since trees are different sizes, it would be difficult to say how much paper comes…

Samuel Elmer Imes

chemist, physicistBorn: 10/12/1883Birthplace: Memphis, Tenn. In 1918, Samuel Elmer Imes became only the second African American to earn a doctorate in physics. His dissertation broke new scientific…

Robert Matsui

CongressmanBorn: 1941 A graduate of the University of California at Berkeley and Hastings College of Law, Matsui established a private law practice in 1967. He was elected to the Sacramento City…

Harrison Ford

actorBorn: 7/13/1942Birthplace: Chicago By several measures the most successful actor of his generation, Ford has turned his quiet Everyman persona into invincible Hollywood gold, appearing in many…

Jean-Claude Vrinat Biography

restaurant ownerDied: January 7, 2008 (Paris, France) Best Known as: owner and director of Taillevent restaurant in Paris Owner of the famous Taillevent…

DK Science: Conservation

RECREATING THE QUAGGABIODIVERSITYFIND OUT MOREWildlife conservation is becoming increasingly important. Not many animals can evolve quickly enough to survive human-induced change, and few…

Space Fungus

by David Johnson   Even though spacecraft are thoroughly sanitized, scientists have been startled to learn that some 250 species of bacteria and fungi can live and even thrive in outer…