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Why Does My Shadow Change Color?--Consider the Following With Bill Nye
Why Does My Shadow Change Color? Bill Nye sheds some colorful light on this shady topic.
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Accelerate progress in our three core enterprises — Explore Worlds, Find Life, and Defend Earth. You can support the entire fund, or designate a core enterprise of your choice.
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Know the cosmos and our place within it.
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Empowering the world's citizens to advance space science and exploration.