"<strong>April 23: </strong>The Solar Impulse 2 flies over San Francisco. The solar-powered airplane, flying around the world without a single drop of fuel, <a href=""http://www.cnn.com/2016/04/24/travel/solar-impulse-2-plane-california/index.html"" target=""_blank"">landed in California</a> after a two-and-a-half-day flight across the Pacific Ocean."
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