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The Ice Bucket Challenge raised $115 million for ALS four years ago. Now the "Lemon Face Challenge" is raising money to fight a type of brain cancer called DIPG. You just record your reaction while eating a lemon wedge, challenge someone else to do it and donate to a group called Aubreigh's Army.
The Arizona Diamondbacks were challenged and they accepted!
Nick Saban took the challenge as well.
You can learn more about Aubreaigh's Army at their Facebook page here.