Celebrating the 50th Anniversaries of Earth Day and Smithsonian Magazine With 50 Things We’ve Learned About Earth

This article from Smithsonian Magazine is a great and intense summary of what we’ve learned over the past 50 years:

In honor of the 50th anniversary of Earth Day, and the 50th anniversary of Smithsonian magazine, the staff of Smithsonian magazine challenged scientists, historians, researchers, astrophysicists, curators and research scholars across the Smithsonian Institution to identify something about the planet that has been revealed over the past 50 years.

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