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Calvin Fuller Biography

inventorBorn: 25 May 1902Best Known as: co-creator of the silicon solar cell Chemist Calvin Fuller, along with Bell Labs colleagues Daryl Chapin and Gerald Pearson,…

Gerald Pearson Biography

inventorBorn: 31 March 1905Best Known as: co-creator of the silicon solar cell Gerald Pearson, along with Bell Labs colleagues Daryl Chapin and Calvin Fuller,…

The Russian Revolution

1917 - The October Revolution       Revolutionary leader Leon Trotsky In April, 1917, Lenin and other revolutionaries returned to Russia after having been permitted by the German…

DK History: Age Of Empire

THE WORLD IN 1900 WHY DID EUROPEANS WANT TO RULE THE WORLD? HOW WERE PEOPLE TREATED BY THEIR RULERS? BRITISH RAJSCRAMBLE FOR AFRICAFRENCH FOREIGN LEGIONFIND OUT MOREFrom the 19th century until the…

A History of the Supreme Court

Photo Source: iStock The US Supreme Court has presided over numerous landmark cases, with many having a significant social, cultural and environmental impact on the United States. Here we provide an…

folk medicine

(Encyclopedia) folk medicine, methods of curing by means of healing objects, herbs, or animal parts; ceremony; conjuring, magic, or witchcraft; and other means apart from the formalized practice of…

DK History: Monarchy

WHAT WAS THE DIVINE RIGHT OF KINGS? WERE KINGS EVER ELECTED? DYNASTIESFIND OUT MOREMonarchy means rule by a single person, such as a king or a queen. Normally, rule passes from one generation to…

Algebra: Greatest Common Factors

Greatest Common Factors Algebra Factoring Polynomials Greatest Common Factors Factoring by Grouping Special Factoring Patterns Factoring Trinomials Using Their Coefficients Factoring with the…

Article II

Section 1[The president; the executive power.—1.] The executive power shall be vested in a President of the United States of America. He shall hold his office during the term of four years, and,…

Algebra: Combining Rational Expressions

Combining Rational Expressions Algebra Rational Expressions Simplifying Rational Expressions Combining Rational Expressions Multiplying and Dividing Rationally Encountering Complex Fractions…