Days And Years
21st February is celebrated as

World Population Day
International Mother Language Day
National Statistics Day
Self Injury Awareness Day

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Days And Years
India Celebrates February 28 every year as 'National Science Day' because on this day

in 1928 C.V. Raman discovered what was later called the 'Raman Effect'
Vikram Sarabhai was born
Nehru laid the foundation of Science labs all over India
first Indian Space craft was launched

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