Days And Years
25th April is celebrated as

World Malaria Day
World Population Day
World Mosquito Day
International Nurse 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'
Nehru laid the foundation of Science labs all over India
first Indian Space craft was launched
Vikram Sarabhai was born

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