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Earth

07/11/2012 - 13:46
"There are many regions on Earth where vegetation struggles to reach optimum productivity because of sparse nutrients, such as nitrogen or...
30/03/2012 - 20:42
A. NEW KNOWLEDGE 6. Humanity has taken a huge leap and become a planetary-scale force. Significant changes have occurred since the 1950s,...
05/02/2012 - 15:20
Light travels at about 186,000 miles per second. "They've either passed us by, or they stay around their home star systems and contemplate...

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