This interesting encyclopedia entry tells about Paul Cuffe, a black abolitionist and philanthropist who attempted to form a colony in Africa for freed slaves.

This encyclopedia entry gives an overview of Colin Powell's life, including his military career and his appointment as Secretary of State.

An encyclopedia entry telling about Peter Salem, a slave who fought in the Revolutionary War and reportedly fired the shot that killed Major Pitcairn at Bunker Hill.

In this encyclopedia article, you can learn about Col. Charles Young, the first African-American colonel in the U.S. Army.

An in-depth encyclopedia article from Wikipedia on economist John Maynard Keynes details his life and professional works, and gives information about his skills as an investor.

Find facts about Oklahoma's rich history and famous people, and explore museums and historic sites. An interactive map of the state allows you to choose museums, military sites, historic homes, and other notable locations in Oklahoma,...

Photograph of Jesse Owens, racing.

Facts about Chad including environmental issues, geography, government, people, water, economy, agriculture, health, natural resources, energy use, and conflict.

This encyclopedia article from Wikipedia on adaptive radiation discusses what it is, lists some examples, and distinguishes between the three different types of adaptive radiation.

A proof to show that the square root of two is an irrational number, followed by a shorter and even more beautiful proof.

This encyclopedia article from Wikipedia provides a brief biography of Carl Sagan, the American astronomer who pioneered exobiology and promoted the Search for Extraterrestrial Intelligence (SETI), and science in general.

This encyclopedia article offers a general overview of electrolytes. Content differentiates the difference in meaning when used in the context of chemistry vs. the context of physiology.

This encyclopedia article from Wikipedia provides a general overview of the mineral opal.

This article from Wikipedia, an open-source encyclopedia, offers a general overview of german shepherds. Content includes a look at this dog's appearance, temperament, health, and history.

Providing a detailed encyclopedia article on the game of cricket, this website includes a general definition, the laws of cricket, a history of the sport, references, and more. Find photos of a cricket match, diagrams showing a standard...

A detailed Wikipedia encyclopedia article on fuel cells explains what they are, the controversies in the use of hydrogen as a fuel, and practical problems. There is also a lengthy section on the five generally recognized types of fuel...

Article provides a compilation of material from Compton's living encyclopedia. General information about Chinese religion and philosophy.

Information about the Theban general and victor of the Battle of Leuctra, Epaminondas. Most of this is an excerpt from The Encyclopedia of the Ancient World.

Wikipedia, an open-source encyclopedia, offers a general overview of the taiga biome. A long list of taiga eco-regions can be found, each linking to its own encyclopedia entry.

Provides a general overview of the siege of Vicksburg. Content includes a small map of the area on July 3, 1863. From "Historical Times Encyclopedia of the Civil War" edited by Patricia L. Faust.

This encyclopedia article from Wikipedia provides a general overview of the gemstone topaz. Liinks are provided for additional information on related subjects.

This encyclopedia article from Wikipedia provides a general overview of squid. Content includes a focus on their physical characteristics, diet, and habitat.

Wikipedia, an open-source encyclopedia, offers great information on the classification system used in Biology. Covers the benefits of the system, history, and general information on the whole system together.

Providing a detailed encyclopedia article on the game of cricket, this website includes a general definition, the laws of cricket, a history of the sport, references, and more. Find photos of a cricket match, diagrams showing a standard...