The number of students in higher education has more than doubled in about twenty years, passing 250 million according to UNESCO. Worldwide, women now outnumber men on campus, a reversal that happened in the early 2000s. In most regions they also make up the majority of graduates, although they remain a minority in engineering and computing.
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.