Earth Day is April 22. Here's what to know about how Earth Day happened and how to celebrate our planet this April.
On anniversary of first Earth Day, a look at what's happened since. April 22, 2010— -- On April 22, 1970, the very first Earth Day, more than 20 million people joined in demonstrations across the ...
Earth takes 24 hours to complete a full rotation in a standard day, equal to exactly 86,400 seconds. July 9 was the first of three days in which a millisecond or more could be shaved off the clock on ...
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