If you would have lived in Greece in about 300BC, you could have witnessed The battle of Thermopyle
OPEC was protesting because the U.S. was supporting the Israeli military leader during the Yom Kippur War.
The brain. Modern homo sapiens such as humans have much larger brain than the early homo sapiens due to the fact that food at the time was becoming scarce so the need for the homo sapiens to become smarter was a necessity. And because of this early homisapiens brains evolved to become much larger than what they were before
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