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In Texas, Dara witnesses a rare total solar eclipse before meeting astronomer Stella Offner to uncover the Sun's origins and power. At Kew Gardens, Dr. Caspar Chater explains how sunlight enabled life to evolve. Dara explores humanity's reverence for the Sun, visits off-grid solar pioneers, learns about its health benefits, and travels to France's ITER project, where scientists strive to replicate solar fusion on Earth.