A viral trend is back. Has ALS research progressed since the first Ice Bucket Challenge?

After former NFL running back Chris Johnson announced his diagnosis, experts hope the challenge's revival will help create a ...
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It's cold. It's wet. It's for a good cause. Why the Ice Bucket Challenge is back after more than a decade.

Add Yahoo as a preferred source to see more of our stories on Google. The Ice Bucket Challenge is now spreading awareness about mental health. (Getty Creative) (Marc Dufresne via Getty Images) This ...