179121479125786First_Children__s_Encyclopedia

213 What is science? Zoology. Materials science Our Universe is filled with atoms and elements, molecules, mixtures, and compoun ...

214 Science begins with problems. The world’s great scientists were all thinkers who wanted to solve life’s problems. This need ...

215 Advances in science Benjamin Franklin. Inventions Inventions and discoveries have changed the course of our history. Paper ( ...

216 Who invented frozen food? Science and technology Albert Einstein (1879–1955) German-born physicist Albert Einstein’s famous ...

Advances in science Clarence Birdseye, in 1924. Modern inventions Imagine the world without these fantastic inventions: Alan Tur ...

218 Being a scientist How much bigger do things look through a microscope? Science and technology Scientists study the world aro ...

219 A closer look During the 17th century, the microscope was developed by Dutchman Anton van Leeuwenhoek and refined by Robert ...

220 Science and everyday life What was the first satellite in space? Science and technology Cities at night are bright places, l ...

221 Science and everyday life 221 As^ fast^ as^ a^ s peeding^ bullet^ tr ain...? Sputnik 1. It was launched by the Soviet Union ...

222 Every living thing contains carbon. Human beings take in carbon through carbohydrates, fats, and proteins in food, and relea ...

223 DigestersDecomposition in the soil is helped along by the endless action of worms and bacteria. These animals are an importa ...

224 Some materials are hard and brittle, while others are flexible. Some materials are colourful, while others are transparent. ...

225 Brittleness Some materials, such as glass, are very brittle and will break when pushed out of shape. Safety glass is designe ...

226 When solids get hot enough, they melt and become liquids. When liquids get cold enough, they freeze and become solid. This i ...

227 Freezing Icicles are spikes of ice that form when dripping water freezes. You often see them on trees in winter. If water ke ...

228 Amazing atoms E l e c t r o n s w h iz z^ around (^) t he (^) nu c l e u s o f^ th e at om If you could keep smashing an obj ...

229 The mighty atom When the nucleus of an atom is split, it releases a huge amount of energy. Nuclear bombs use this “atomic en ...

230 In most materials, atoms are joined in tiny groups called molecules. The shapes of molecules and the way they pack together ...

231 Diamond molecule Diamond is the hardest natural substance known. Its hardness comes from the way the carbon atoms in each di ...

232 When the atoms in molecules rearrange to form new kinds of molecules, we say a chemical reaction has taken place. Chemical r ...