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It's Okay to Be Smart
Blood Types Are Weirder Than You Think
Season 13
Episode 8
Across life on Earth, blood comes in blue, green, purple, even clear. But why? And what makes your blood different from mine? This is the strange world of blood—what it does, why it varies, and why we can’t live without it.
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9:42
We explore why animals like whales, elephants, and other large animals not get cancer.