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What percent of Earth is water?

The Earth is often compared to a majestic blue marble, especially by those privileged few who have gazed upon it from orbit. This is due to the prevalence of water on the planet's surface. While water itself is not blue, ...

dateDec 02, 2014 in Earth Sciences
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Why moderate beliefs rarely prevail

(—We live in a world of extremes, where being fervently for or against an issue often becomes the dominant social ideology – until an opposing belief that is equally extreme emerges to challenge the first one, ...

dateOct 02, 2012 in Mathematics feature
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