The powerful story behind the man who inspired the Ice Bucket Challenge

Three years ago, a fun new way to raise money for a serious cause – ALS research – took the world by storm. Now a new book, “The Ice Bucket Challenge: Pete Frates and the Fight against ALS,” reveals the inspiring story behind the phenomenon. NBC’s Kate Snow reports for TODAY.

Five people sit around a table on the "TODAY" morning television show set. Four of them are deeply engaged in discussing something, while one looks intently at the person speaking.

Click image to watch video