humic acid

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Tilled farmland. (farming, dirt, soil conservation)

Could We Lose All the Soil on Earth?

Solar system illustration. (planets; sun)

Why Are Planets Round?

Astronomical Observatory of the Mojon del Trigo. Long exposure using the star trail technique. Sierra Nevada National Park, in the province of Granada, Andalusia.

Is Earth Going to Change the Direction in Which It Rotates?

Solar system illustration. (Sun; planets)

A Model of the Cosmos

Paleogeography and paleoceanography of Early Triassic time. The present-day coastlines and tectonic boundaries of the configured continents are shown at the lower right. Continents, continental drift, plate tectonics, Pangea, Laurussia, Gondwana.

Spotting a Supercontinent: How Pangea Was Discovered

Discover

Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.

12 Greek Gods and Goddesses

Plato (left) and Aristotle, detail from School of Athens, fresco by Raphael, 1508-11; in the Stanza della Segnatura, the Vatican. Plato points to the heavens and the realm of Forms, Aristotle to the earth and the realm of things.

Plato and Aristotle: How Do They Differ?

Confucius statue at a Confucian Temple in Shanghai, China. Confucianism religion

What is the Difference Between Daoism and Confucianism?

Diverse elementary school children wearing school uniforms running outside of school. Boys girls

Pro and Con: School Uniforms

Santa Claus flying in his sleigh, christmas, reindeer

Was Santa Claus a Real Person?

Adolf Hitler (Nazi, nazism, German leader).

9 Things You Might Not Know About Adolf Hitler

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

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organic compound protein hormone lipid carboxylic acid hydrocarbon heterocyclic compound organosulfur compound nucleic acid carbohydrate steroid