Since Satya Nadella became Microsofts third CEO in February, weve gradually learned more about him. Nadella is helping raise money to help fight amyotrophic lateral sclerosis, or ALS, and Microsoft contributed by staging a hackathon. It shows Nadella taking whats known as the ice bucket challenge, which the company describes as: a social media movement wherein people post videos of themselves dumping a bucket of ice water over their heads.