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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,…

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…

Natural Disasters in Texas

Source: iStock From blistering wildfires and devastating hurricanes to snow blizzards and flash floods, Texas has it all. The wide range of natural disasters that happen in the Lone Star State is…

Reclamation, United States Bureau of

(Encyclopedia) Reclamation, United States Bureau of, agency set up in the Dept. of the Interior under the Reclamation Act of 1902. It is charged with promoting regional economies by developing water…

Checking in: Japan One Year Later

A look at how Japan has recovered one year after the devastating earthquake, tsunami, and nuclear disaster. By Jennie Wood Anti-Nuclear Power Plant Rally,…

DK History: Middle East

WHY HAS THERE BEEN FIGHTING IN ISRAEL? WHO CAME TO POWER IN IRAQ? FIND OUT MOREThe Middle East saw much conflict during the last century. Its deserts contain the world’s biggest oil fields, which…