A lot has changed since High School Musical debuted on Disney Channel Jan. 20, 2006. Head back to East High to find out what Zac Efron, Vanessa Hudgens, Ashley Tisdale and more stars are up to now.

Before graduating from a California high school, students must complete a minimum of 13 state-mandated courses, including three years of English, two years of math and two years of science.

Before Donald Trump is sworn in as the 47th president of the United States on Jan. 20, look back at what past Inauguration Day attendees have worn to the ceremony over the years. Before Donald ...