How many songs go on a perfect playlist? What's the statute of limitations on sending people photos? Do outside plants get dusty like houseplants? Does the moon's orbit line up with Earth's the solar system's? Why don't eyes fog up like glasses? What did people think of static electricity before the discovery of electricity? How do I track down a mystery smell? What is Groundhog Day? Can you make art in space? Hank Green and Katherine Green have answers!

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