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DK Science: Medical Technology

HI-TECH IMAGING SURGERY ARTIFICIAL DEVICES FIND OUT MORE Technology plays an increasingly important role in modern medicine. Today, HI-TECH IMAGING allows doctors to view internal body…

DK Science: Recycling

LANDFILL SITESROLLING STEELSHEET STEELRECYCLING PAPERRECYCLED PLASTICBIODEGRADABLEFIND OUT MOREMany things we normally throw away can be recycled (used again), including paper, glass, metals,…

DK Science & Technology: Changing Materials

HOW DO CHEMICAL REACTIONS CHANGE MATERIALS? RUSTING IRON WHAT MAKES GLUE STICK? HOW DOES HEAT CHANGE MATERIALS? REVERSIBLE CHANGESPERMANENT CHANGESFIND OUT MOREWe can use chemical reactions and…

DK Earth: Atmosphere

DOES THE ATMOSPHERE REMAIN THE SAME FROM EARTH TO SPACE? WHAT IS ATMOSPHERIC PRESSURE? FIVE ATMOSPHERE LAYERSOZONE LAYERFIND OUT MOREMost life on Earth depends on the atmosphere, a bubble of gases…

Menacing Monster Guide

Fact Monster'sMenacing Monster Guide by David Johnson Goblins From their birthplace in France, these nasty, hideous cousins of gnomes have spread all over Europe. When they…

diesel engine

(Encyclopedia) diesel engine, type of internal-combustion engine invented by the German engineer Rudolf Diesel and patented by him in 1892. Although his engine was designed to use coal dust as fuel,…

ethanol

(Encyclopedia) ethanolethanolĕthˈənōlˌ [key] or ethyl alcohol, CH3CH2OH, a colorless liquid with characteristic odor and taste; commonly called grain alcohol or simply alcohol. Ethanol is used…