References
Latest References

Who were the Huns, the nomadic horse warriors who invaded ancient Europe?
By Tom Garlinghouse last updated
The Huns were nomadic horse warriors, originally from Asia, who invaded Europe in the late fourth century A.D. and carved out an empire that stretched from Asia to Europe.

These are the three shoes we will be wearing for marathon training
By Kate Carter published
It's the start of your marathon training, and here is everything you need, from the best running shoes to a home treadmill

Tiwanaku: A little-known pre-Incan civilization that built temples and cities high in the Andes
By Owen Jarus, Laura Geggel last updated
This ancient city in modern-day Bolivia is almost 13,000 feet above sea level. Only a small portion of the ruins have been excavated.

Echidnas: Facts about spiky Australian mammals that lay eggs
By Marilyn Perkins, Alina Bradford last updated
Discover interesting facts about echidnas, the strange platypus relative with spines, spurs and a pouch.

The human heart: Facts about the body's hardest-working muscle
By Mindy Weisberger last updated
Discover interesting facts about the fist-size organ that powers the circulatory system.

The San Andreas Fault: Facts about the crack in California's crust that could unleash the 'Big One'
By Stephanie Pappas published
California's San Andreas Fault is capable of triggering a massive earthquake. Here's what to know about this famous location often associated with earthquakes.

Who were the Denisovans, archaic humans who lived in Asia and went extinct around 30,000 years ago?
By Charles Q. Choi last updated
Who were the Denisovans, close human relatives who lived in Asia and mated with Homo sapiens?

Crows: Facts about the clever birds that live all over the world
By Marilyn Perkins, Alina Bradford last updated
Discover interesting facts about how crows remember faces, mimic human speech and more.
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