According to a new study, the answer is somewhere around 3.04 trillion. That's about 400 trees for every person. 12,000 years ago, before the advent of agriculture, Earth...
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A candle clock is a thin candle with consistently spaced markings (usually with numbers), that when burned, indicate the passage of per... -
People with blue eyes have a single, common ancestor, according to new research. A team of scientists has tracked down a genetic mutati... -
“Some Chimpanzees Have Entered Stone Age.” Scientists On 3 Continents Make Surprising Discovery. In the rainforests of west Africa, th...