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lares

(Encyclopedia) lareslareslârˈēz [key], in Roman religion, guardian spirits. According to some they were ghosts of the dead, destructive spirits who frequented crossroads and had to be propitiated.…

spell

(Encyclopedia) spell, word, formula, or incantation believed to have magical powers. The spell can be used for evil or good ends; if evil, it is a technique of sorcery. Many authorities believe that…

Stuart, Gilbert

(Encyclopedia) Stuart, Gilbert, 1755–1828, American portrait painter, b. North Kingstown, R.I., best known for his portraits of George Washington. Having shown an early talent for drawing, he became…

Selected Activists and Reformers

Sojourner Truth See also Martin Luther King, Jr., Biography Martin Luther King, Jr., Timeline African-American Religious Leaders Civil Rights Leaders Civil Rights Movement Heroes…

Algebra: Simplifying Radical Expressions

Simplifying Radical Expressions Algebra Wrestling with Radicals Introducing the Radical Sign Simplifying Radical Expressions Unleashing Radical Powers Radical Operations Solving Radical…

DK Science: Energy Sources

ENERGY FROM THE SUNINSIDE A NUCLEAR POWER STATIONRENEWABLE ENERGYGEOTHERMAL ENERGYFIND OUT MOREEverything we do takes energy, which we get from many different sources. Most of the energy on Earth…

DK Science: Work

EFFICIENCYPOWERJOULESFIND OUT MOREScientists use the word work to describe the energy needed to do a task, by making a force move through a distance. The amount of work done is equal to the…

Earth Day by the Numbers

April 22, 2017, marks the 47th anniversary of Earth Day—a day intended to inspire awareness and appreciation for the Earth's natural environment. Organizers started Earth Day in response to a…

Earth Day by the Numbers

April 22, 2016, marks the 46th anniversary of Earth Day—a day intended to inspire awareness and…

Perry, Matthew Calbraith

(Encyclopedia) Perry, Matthew Calbraith, 1794–1858, American naval officer, b. South Kingstown, R.I.; brother of Oliver Hazard Perry. Appointed a midshipman in 1809, he first served under his brother…