It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
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Studies suggest that people who appear to be constantly distracted have more "working memory" and "sharper brains".
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In Korea, a child’s first birthday is the most important. In one part of the celebration, several items are placed on a table. The one that the baby picks up first is said to predict their future.
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The first man to swim the length of Great Britain grew a beard to stop jellyfish stinging his face.
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The average American spends a third of their overall time online playing games and using social networks.
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Americans throw out 4.5 pounds of trash a day - twice that of 40 years ago.
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Only about 2% of the world population has green eyes.
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