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ennis court. Through her activism, high-profile endorsements, TV and film appearances and writing (including a guide to life written with her sister, Venus), Williams inspires millions of fans worldwide. serenawilliams.com @serenawilliams on Instagram Gayle King Journalist Gayle King is a co-host of "

tic science mission than as a technology demonstration. Going Light: Solar Sails A solar sail, such as the one used by the Japanese IKAROS probe to Venus, does away with propel- lant and engines altogether. It exploits the physics of light. Like anything else in motion, a light wave has BETA PRODUCT

ng about Light and Matter, Richard Feynman relates the story of the ancient Mayan astronomers. 3000 years ago they were able to predict the motion of Venus in the sky using only pebbles. They had a simple system that could predict when the planet would rise over the horizon. Put a stone in the jar every