Nature: What Made Two Groups of Chimpanzees Go to War?
What Made These Chimpanzees Go to War? Scientists Finally Have Answers
9:54
Visit the Largest and Oldest Fortress City in Europe
The historic fortified city of Carcassonne is a World Heritage site in southwestern France, considered by many experts to be the largest and oldest fortress city in Europe.
6:33
From a Day to Forever: Comparing Animal Longevity
Time is the ultimate currency, but in the animal kingdom, the exchange rate varies wildly. Let's learn about their different lifespans.
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