Arabic, Chinese, English, French, Russian and Spanish are the six official languages of the United Nations. Official documents are published in all of them, and major meetings are interpreted simultaneously. When the UN was founded in 1945, Arabic was not on the list: the General Assembly added it in 1973. Within the Secretariat, only English and French serve as working languages. Each official language even has its own day, with French celebrated on 20 March.
That's the estimate from a WHO-led study published in The Lancet in 2024, covering the half-century since the Expanded Programme on Immunization was launched in 1974. It works out to about six lives saved every minute, mostly infants. The measles vaccine alone accounts for around 60% of those lives.
According to the World Gold Council, about 216,000 tonnes of gold have been mined in all of human history. Because gold is so dense (19.3 tonnes per cubic metre), it would fit in a cube about 22 metres on each side, roughly the height of a seven-storey building. Strikingly, about two-thirds of it has been mined since 1950.