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Fred Thompson

Candidate for the 2008 Republican presidential nomination by Beth Rowen Fred Thompson Related Links Fred Thompson’s campaign website Profile of Tennessee…

Theories of the Universe: The Particle Zoo

The Particle ZooTheories of the UniverseForces, Particles, and Some Cosmological GlueSize in the MicrocosmThe Forces You Already KnowThe Particle ZooThe Last Train to Quarkville One of the most…

DK Nature: Vertebrates

VERTEBRATE GROUPS REPTILES BIRDS MAMMALS AMPHIBIANS FISH WHAT DOES THE SKELETON DO? HOW MANY LIMBS DO VERTEBRATES HAVE? FIND OUT MOREAll vertebrates have an inner skeleton, including a skull…

DK Science: Skin

SKIN LAYERS HAIR FOLLICLE FINGERNAIL TEMPERATURE CONTROL FIND OUT MORE The skin, along with hair and nails, provides the body with a protective outer covering that shields it, for…

DK History: Polynesia

WHERE WERE POLYNESIANS FROM? WHY DID PEOPLE SET SAIL FOR POLYNESIA? HOW DID THE SETTLERS NAVIGATE? MAORISFIND OUT MOREPolynesia is a group of scattered islands in the vast Pacific Ocean. Around…

cobalt, chemical element

(Encyclopedia) cobalt, metallic chemical element; symbol Co; at. no. 27; at. wt. 58.9332; m.p. 1,495℃; b.p. about 2,870℃; sp. gr. 8.9 at 20℃; valence +2 or +3. Cobalt is a silver-white, lustrous,…

rainbow

(Encyclopedia) rainbow, arc showing the colors of the spectrum, violet inside and red outside, which appears when the sun shines through water droplets. It often appears while the sun is shining…

science fiction

(Encyclopedia) science fiction, literary genre in which a background of science or pseudoscience is an integral part of the story. Although science fiction is a form of fantastic literature, many of…

shark

(Encyclopedia) shark, member of a group of almost exclusively marine and predaceous fishes. There are about 250 species of sharks, ranging from the 2-ft (60-cm) pygmy shark to 50-ft (15-m) giants.…

Raphael Santi

(Encyclopedia) Raphael Santi or Raphael Sanzio, Ital. Raffaello Santi or Raffaello SanzioRaphael Santiräfˌfäĕlˈlō sänˈtē, sänˈtsyō [key], 1483–1520, major Italian Renaissance painter, b. Urbino. In…