Whenever Serena Williams is not too busy winning Grand Slam title after Grand Slam title, she's trying to figure out the lore behind Avatar: The Last Airbender

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Williams asked a lingering question about the series on Twitter , specifically about the origins of humans learning how to bend. "Avatar last air bender fans only: Question- If the original benders were the sky bisons, badger moles, and dragons; how does that tie in with Avatar Wan when the lion sea turtle gave all the people bending power?????" Williams tweeted.Of course, as you'd expect Williams received plenty of replies with different answers. Most fans suggest animals learned how to bend from the elements, while the lion sea turtles gave humans the power to bend.According to a few fans, humans then mastered the art of bending from animals after being given the special power. Whatever the exact answer may be, here's hoping Williams is now one step closer to understanding the lore behind the hit animated series.For more on Avatar: The Last Airbender, find out about the new Dark Horse comics coming out later this fall and check out the Avatar: The Last Airbender - The Complete Series Blu-ray box set, which will be released this summer.

Alex Gilyadov is a freelance writer for IGN. Be sure to check out his YouTube channel and follow him on Twitter