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What’s the best time to build a sandcastle? Tim and Moby can help you figure that out as they introduce you to tides. In this BrainPOP movie, you’ll learn how the Earth, moon, and sun all work together to cause shifts in the Earth’s main bodies of water. You’ll discover how tides can be used to power machinery and make electricity! You’ll also find out why most water-lined places have two high tides and two low tides every day. Okay, so your sandcastle still won’t last forever, but you might get a few more hours out of it!