- Kreb's Cycle or TCA Cycle (Tricarboxylic acid Cycle) was elucidated by Hans Krebs (1935) for which he received a Noble Prize.
- Louis Pasteur discovered that all types of pox are caused by viruses. He prepared the vaccine in 1865.
- BCG - Tuberculosis vaccine.
- World Radio Day is on 13 February. It was originally proposed by Spain.
- Hitler (Nazism) kept Swastika as his party's emblem.
- Kutch is the largest district in the state of Gujarat and is the 2nd largest district of India after Leh.
- Blood pressure greater than 160/95 mm Hg is called hypertension.
- Increased glucose level in the blood is called hyperglycermia.
- Amartya Sen (Indian economist & 1998 Nobel Prize winner in economics) receives National Medal of Humanities from Obama for the year 2011.
- Edward Jenner was the first one developed the vaccine.
- Louis Pasteur discovered pox viruses.
- The Central Coffee Research Institute (CCRI) is located in Chickmagalur District of Karnataka.
- Coleman - founder of Coffee Research in India.
- The Indian National Congress (INC) was founded in 1885 due to the initiative of Allan Octavian Hume, a retired British civil servant.
- In April, 1986 the World's worst nuclear power accident occurred at Chernobyl, in the former USSR (now Ukraine).
- April 22 - Earth Day.
- The term mutation was first used by Hugo de Vries (1901) who observed it in Oenothera lamarckiana.
- The present name chromosome (Greek: Chrom = colour, soma = body) was coined by Waldeyer (1888).
- The United Nations General Assembly has decided to observe 20 February annually, starting in 2009, as the World Day of Social Justice.
- In 1905 Lord Curzon announced the partition of Bengal.
- In 1906 the All India Muslim League was formed under the leadership of Salimullah khan.
- On November 29, 1947, the UN General Assembly voted to partition Palestine into two states, one Jewish and the other Arab.
- International Mother Language Day is celebrated on the 21st of February every year since 2000.
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