February

February is dominated by one heavyweight scientific anniversary and a cluster of days tied to health, safety, and remembrance.

• 4 February — World Cancer Day, observed under the initiative of the Union for International Cancer Control (UICC) since 2000, aimed at raising awareness and encouraging prevention, detection, and treatment of cancer worldwide.
• 13 February — World Radio Day, marking the anniversary of the founding of UN Radio in 1946; proclaimed by UNESCO in 2011 and later adopted by the UN General Assembly, celebrating radio as a medium for information, education, and free expression.
• 20 February — World Day of Social Justice, established by the UN General Assembly in 2007 to promote efforts to tackle poverty, exclusion, and unemployment, and to support the goals of social development set out at the 1995 World Summit for Social Development.
• 21 February — International Mother Language Day, proclaimed by UNESCO in 1999, marking the anniversary of a 1952 incident in Dhaka (then East Pakistan) in which students protesting for the recognition of Bangla as an official language were killed by police — the day promotes linguistic and cultural diversity worldwide, and is directly rooted in that specific tragedy rather than a generic linguistics theme.
• 24 February — Central Excise Day, commemorating the day in 1944 the Central Excise and Salt Act was passed, recognising the contribution of the Central Board of Indirect Taxes and Customs.
• 28 February — National Science Day, commemorating the day in 1928 that Sir C.V. Raman announced his discovery of the Raman Effect — the scattering of light changes wavelength when it passes through a transparent medium — a discovery that won him India's first Nobel Prize in the sciences (Physics, 1930); first observed as National Science Day in 1987, following a National Council for Science and Technology Communication proposal, and it remains the single most-tested "why this specific date" science fact in the Indian exam calendar. (Note: in a leap year, National Science Day still falls on 28 February, not 29 February — worth flagging since leap-year date confusion is a real trap.)

Memory hook — "Raman announced, the nation remembers": 28 February 1928 is the announcement date of the Raman Effect, not the date it was awarded the Nobel (1930) — a frequent trap is to confuse "discovery/announcement date" with "Nobel Prize year"; keep the two years (1928 vs 1930) firmly apart.

Practice Recall: State the exact discovery National Science Day commemorates, the year it was announced, and the year the same discovery won a Nobel Prize — without letting the two years blur into one.