It was a video six years in the making. From 2000 to 2006, Noah Kalina took a photo of himself every day and linked all the individual frames together to form a fascinating six-minute look into the subtle ways one man ages.
YouTube's 50 Best Videos
YouTube — breeding ground for the Web's wackiest and wildest viral videos — turns 5 in 2010. In recognition, TIME takes a look back at the site's 50 greatest hits