Earth Day's Big Blue Marble

On Earth Day, we often see the NASA photo from space of Earth as a Big Blue Marble, but what makes it blue? The ocean! We talked with Wallace J. Nichols about, the global movement inspired by the Earth as a Blue Marble. The idea? Pass a blue marble through every person’s hand on earth, with a simple message of gratitude along with it. (Photo courtesy of Neil Osborne)

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