Natural, Scientific and Medical Wonders
The Blog to Read about and View the Wonders in Nature, Science and Medicine!
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Showing posts with label
Space
.
Show all posts
Showing posts with label
Space
.
Show all posts
Saturday, July 14, 2012
Day and night cycles on Earth
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We live on Earth depending mostly on daylight. After sunset we stop our main activities, take rest and go to sleep at night. This refreshes,...
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