Latest References
These are the three shoes we will be wearing for marathon training
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
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
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
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'
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?
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
Discover interesting facts about how crows remember faces, mimic human speech and more.
What are the Dead Sea Scrolls, the ancient texts from the Hebrew Bible found in the caves of Qumran?
The famous biblical manuscripts were found in caves near this ancient settlement.
