21. BEST: Taylor Swift showed off her legs in a David Koma LBD, which she paired with House of Lavande Vintage jewels and black Jimmy Choo heels at New York City’s Z100 Jingle Ball. 2. National Guard troops on the campus of Kent State University in Ohio shot and killed four unarmed students who were protesting the U.S. Invasion of Cambodia on May 4, 1970.