The fossil (left) was unearthed in Wisconsin in 1985. Scientists analyzed it and discovered the ancient animal's respiratory and circulatory organs (center) were near-identical to those of a modern-day scorpion (right).

Fossil is the oldest-known scorpion

Satellite image of the Gibraltar Arc. Credit: NASA

Lithospheric thickening beneath the Betics and Rif mountains pulls down the...

Charoite

Charoite : What is Charoite Stone? How is Charoite Formed?

Topaz Color

Topaz Color : What Color Is Topaz? What causes color in...

An example of a Pallasite meteorite (from the Esquel fall) on display in the Vale Inco Limited Gallery of Minerals at the Royal Ontario Museum.

Meteorite contains the oldest material on Earth: 7-billion-year-old stardust

A fossilized cloudinomorph from the Montgomery Mountains near Pahrump, Nevada. This is representative of the fossil that was analyzed in the study.

Scientists find oldest-known fossilized digestive tract – 550 million years

Mexican Fire Agate

Fire Agate : What is fire agate? How fire agate is...

100 million-year-old amber piece with lizard leg and mycomycete (arrow).

100 million years in amber: Researchers discover oldest fossilized slime mold

The skull of the juvenile T. rex, "Jane", was slender with knife-like teeth, having not yet grown big enough to crush bone.

Researchers learn more about teen-age T. rex

Fossil cast of a fin from a juvenile Sauripterus taylori, a late Devonian fish with primitive features of tetrapods.

How fish fins evolved just before the transition to land

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