1905: Kangra earthquake kills 20,000

A massive earthquake measuring 7.8 on the Richter scale decimated the Kangra valley in India’s Himachal Pradesh, killing 20,000 people.

1945: Liberation
of Ohrdruf

American forces liberated the Ohrdruf concentration camp in Germany during the Holocaust, the first such move by the US Army.

1968: Martin
Luther King Jr. shot dead 

African-American civil rights activist Martin Luther King Jr. was shot dead outside a hotel in Memphis by James Earl Ray.

1975: Microsoft

Bill Gates and Paul Allen founded Microsoft, which remains among the world's largest software firms.

1999: Alibaba

Jack Ma founded the Chinese internet company Alibaba.