Tim Cook and Bill Gates Show They Are Up to the Ice Bucket Challenge

Apple CEO Tim Cook and Microsoft co-founder Bill Gates showed they are up to the ALS ice bucket challenge by sharing videos of freezing water being dumped on their respective heads on Friday. Amazon CEO Jeff Bezos and Facebook COO Sheryl Sandberg also joined the ongoing campaign trying to raise awareness and funds to fight amyotrophic lateral sclerosis (ALS).

People taking 'ALS Ice Bucket Challenge' have to pour a bucket of ice water over their heads within 24 hours of receiving the challenge, or make a donation to the ALS Association in the same time period. The foundation says people could do both - take the challenge as well as make a donation, and most tech luminaries seem to have done just that. Those who successfully complete the challenge can challenge others.

Bill Gates and Sheryl Sandberg were challenged by Mark Zuckerberg, while Tim Cook was named by Phil Schiller, after the Facebook CEO and Apple Senior Vice President completed their respective challenges.

Tim Cook accepted the challenge in front of Apple employees, where musician Michael Franti dumped ice-cold water on his head.

Cook then challenged Dr. Dre, Disney's Bob Iger, and Franti himself to do the same within 24 hours.

Bill Gates spent more time preparing for the challenge than most, building a setup that dumped ice-water on him, unlike everyone else who had someone pour it on them.

Gates further challenged Ryan Seacrest, Chris Anderson from TED, and Tesla's Elon Musk.

Facebook COO Sheryl Sandberg accepted Zuckerberg's challenge and posted her video on Facebook:

Amazon CEO Jeff Bezos, who was challenged by Microsoft CEO Satya Nadella, also posted a video of ice bucket being poured on him: