Earth Day
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Earth Day Quiz: 5 Fast Facts You Need to Know
For the Earth Day doodle, Google wants you to break a mental sweat.
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Earth Day 2015: 5 Fast Facts You Need to Know
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PHOTOS: ‘Cowboy & Indian Alliance’ in an Earth Day Protest Against the Keystone XL Pipeline
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LOOK: Google Doodle Unveils Special Earth Day Animals
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Earth Day: 5 Fast Facts You Need to Know