You probably know what most of your body parts are used for—but what about earwax? Your appendix? Or hair on your butt? If you're curious about the function of some of these weird body parts, join Hank for this fun new episode of SciShow, and learn why you have a butt in the first place!

Hosted by: Hank Green

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Original Episodes:
Why Do We Have Earwax? -    • Why do we Have Earwax?  
Why Do We Have Baby Teeth? -    • Why Do We Have Baby Teeth?  
Why Do We Have Such Crooked Teeth -    • Why Do We Have Such Crooked Teeth?  
Your Appendix Isn’t Useless After All -    • Why Your Appendix Actually Matters  
Why do we have Butts -    • Why Do Humans Have Butts?  
Why Do We Have Butt Hair -    • Why Do We Have Butt Hair?  
Vestigial Structures -    • Vestigial Structures