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“With an unprecedented cast of 100 celebrity narrators, Unity is a manifesto for our times, a wake-up call to humanity to get together and make a difference—one person at a time,” says Professor Marcelo Gleiser in his latest blog post on NPR’s 13.7 Cosmos & Culture, in which he interviews Shaun Monson, the writer and director of the new documentary.

Gleiser is the Appleton Professor of Natural Philosophy and a professor of physics and astronomy.