"Hi, my name is Cori Ritchey and I was nominated for the ALS Ice Bucket Challenge by Megan Ritchey. I nominate [insert three names of high school friends I haven't spoken to in 10 years]. You have 24 hours." And then my sister proceeds to dump the whole bucket of ice water over my head.

The Ice Bucket Challenge brought awareness to ALS in 2014. It's back a decade later with a new cause. Here's why, where to donate and the rules.