The rules of the Ice Bucket Challenge are simple: either donate $100 to an ALS charity, or dump a bucket of ice water on your head (or both, if you're sporting). After, you can challenge a few people to join in, too. ALS advocate Pete Frates posted a video that went viral, and in a blink, celebrities, athletes, and tech CEOs all started taking part, raising millions of dollars in the process.
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That's a lot of ice
You've probably seen a good number of photos this week of the rich and famous dumping buckets of ice water over their heads. Here's why.
Apple exec Phil Schiller dumped water on his head for charity, then challenged the CEO
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