The sea is filled with giant, super-smart aquatic mammals communicating across vast distances and using the stars to navigate. No jokes in this description! Whales are amazing!
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While you're at it, check out the Tangents crew on Twitter: Stefan: @itsmestefanchin Ceri: @ceriley Sam: @slamschultz Hank: @hankgreen
If you want to learn more about any of our main topics, check out SciShowTangnets.org