• 1878 – The first telephone directory is issued in New Haven, Connecticut.

• 1958 – The peace symbol, commissioned by Campaign for Nuclear Disarmament in protest against the Atomic Weapons Research Establishment, is designed and completed by Gerald Holtom.

• 1972 – The Soviet unmanned spaceship Luna 20 lands on the Moon.




• Today International Mother Language Day (IMLD) 
 International Mother Language Day is a worldwide annual observance held on 21 February to promote awareness of linguistic and cultural diversity and multilingualism. First announced by UNESCO on 17 November 1999, it was formally recognized by the United Nations General Assembly in its resolution establishing 2008 as the International Year of Languages.