Info:Main Page

New World Encyclopedia integrates facts with values.

Written by online collaboration with certified experts.

Did you know?

At its height the Inca Empire stretched from Colombia to Chile (read more)

Featured Article: Henry David Thoreau

Henry David Thoreau
Henry David Thoreau (July 12, 1817 – May 6, 1862), born David Henry Thoreau was an American author, naturalist, pacifist, philosopher, and transcendentalist. Like his peers Ralph Waldo Emerson, Bronson Alcott, Margaret Fuller, and Nathaniel Hawthorne, Thoreau believed nature to be an expression of God and a symbolic reflection of the transcendent spiritual world that works beyond the physical realm.

Thoreau was not a systematic philosopher but advanced his thought by embedding his ideas in the context of descriptive narrative prose. He is best known for Walden and Civil Disobedience, but wrote many other articles and essays. He was a lifelong abolitionist and delivered lectures attacking the Fugitive Slave Act, praising the writings of Wendell Phillips, and defending the abolitionist John Brown following Brown's assault on the federal arsenal at Harpers Ferry. Thoreau's Civil Disobedience influenced later nonviolent reformers, particularly Mohandas Gandhi and Martin Luther King, Jr.

Popular Article: Algae

A seaweed (Laurencia) up close. The "branches" are multicellular and only about 1 millimeter thick.
Algae (singular alga) are a large and diverse group of photosynthetic, eukaryotic, plant-like organisms that use chlorophyll in capturing light energy, but lack characteristic plant structures such as leaves, roots, flowers, vascular tissue, and seeds. The designation algae includes diverse phyla, including diatoms (golden algae), green algae, euglenoids (flagellates), brown algae, and red algae, and range from single-celled organisms to giant seaweeds. The name alga (plural algae) comes from the Latin word for seaweed. The study of algae is called phycology or algology.

Algae range from single-celled organisms to multi-cellular organisms, some with fairly complex differentiated form and, if marine, called seaweeds. Some of the single-celled organisms may be as small as one micrometer. Multicellular algae may consist of a row of cells, appearing as a filament, or as a thin plate of cells, or even some larger ones may have bodies with a rudimentary division of labor. The multicellular giant kelp reaches 60 meters in length. Seaweeds themselves have many forms, including those that appear as if terrestrial plants with leaves and stems, looking like moss, mushrooms, leaf lettuce, or even palm trees.