On this day in 1971, U.N. Secretary General U Thant signed United Nations proclamation of the vernal equinox as Earth Day.
On this day in 1980, Egypt and Israel established full diplomatic relations.
On this day in 1993, in New York City, a truck bomb parked below the North Tower of the World Trade Center exploded, killing six and injuring over a thousand.
On this day in 2008, the New York Philharmonic performs in Pyongyang, North Korea, the first ever of its kind to take place in North Korea.