* The International Birds Day (the international birds convention was signed in 1906).
* English physician William HARVEY (1578-1657), a founder of modern physiology and embryology, was born 426 years ago. Harvey developed his blood circulation theory in his book "On The Motion Of The Heart And Blood In Animals" (1628).
* French poet and playwright Edmond ROSTAND (1868-1918), the author of the heroic comedy "Cyrano de Bergerac", was born 136 years ago.
* French physicist Claude COHEN-TANNOUDJI was born in 1933, 71 years ago. He won the 1997 Nobel Prize in physics for development of methods to cool and trap atoms with laser light (together with Steven Chu and William D. Phillips).
* Ukraine's Askania-Nova (exists since 1874) was proclaimed state reserve 85 years ago, in 1919.
* April 1 is All Fools' Day.
* Great Russian writer Nikolai GOGOL (1809-1851), the author of comedy "The Inspector General" and novel "The Dead Souls", was born 195 years ago.
* Russian composer, pianist and conductor Sergei RACHMANINOV (1873-1943) was born 131 years ago. In 1918 he emigrated to the US. His most famous works are the opera "Aleko", 2nd and 3rd Piano Concertos, choral symphony "The Bells" and romances.
* Hero of the Soviet Union, Colonel-General Nikolai BERZARIN (1904-1945), the first Soviet commandant of Berlin, was born 100 years ago. He died in a car accident in 1945.
* Soviet aircraft designer, academician Alexander YAKOVLEV (1906-1989) was born 98 years ago.
* Soviet teacher and writer Anton MAKARENKO (1888-1939) died 65 years ago. He was the first to organize mass reeducation of juvenile delinquents at the Maxim Gorky labor colony and Felix Dzerzhinsky children's commune.
* Soviet physicist, academician, winner of the 1962 Nobel Prize Lev LANDAU (1908-1968) died 36 years ago.