Oh, you thought Bill Gates wouldn’t be up to Zuck’s challenge to dump a bucket of icewater on his head for ALS awareness? ALS, or Amyotrophic lateral sclerosis, is a fatal neurodegenerative disease that attacks the brain and spinal cord. You can find more information about ALS here, and donate to the ALS Association here. As is tradition, Gates gets to call out three people to go under the bucket