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L - O

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…

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…

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 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…

DK Science: Energy Waves

OCEAN WAVESBIOGRAPHY: HEINRICH HERTZ German, 1857-1894ELECTROMAGNETIC SPECTRUMSEISMIC WAVESFIND OUT MOREMany different kinds of energy travel in waves. Sound waves carry noises through the air to…

inchworm

(Encyclopedia) inchworm, name for the larvae of moths of the family Geometridae, a large, cosmopolitan group with over 1,200 species indigenous to North America. Also called measuring worms,…

hydrology

(Encyclopedia) hydrology, study of water and its properties, including its distribution and movement in and through the land areas of the earth. The hydrologic cycle consists of the passage of water…

Janus, in astronomy

(Encyclopedia) JanusJanusjāˈnəs [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn X (or S10), Janus is an irregularly shaped (nonspherical) body…

Didot, François

(Encyclopedia) Didot, FrançoisDidot, FrançoisfräNswäˈ dēdōˈ [key], 1689–1757, Parisian printer. The son of a printer, Denis Didot, he was the first of the family to win fame in his craft. His son,…