Prime numbers

Figuring out Bill Gates

$85.3bn

(£64.8bn) – his estimated wealth

5.6m

the number of people who it is estimated will die if there is a 10pc cut to HIV funding

£100m

the amount committed by the UK to eradicating polio

£360m

the amount, over five years, Britain has promised to combating neglected tropical diseases; another of the Gates Foundation’s partnerships

20 cents

(15p) – the cost of a measles vaccine. 150,000 children die annually from the disease

3m

members of the Women’s Development Army in Ethiopia, backed by the Gates Foundation, encouraging the best practices to reduce maternal mortality

75%

the increase in adults having a bank account, since 2005. Improving access to financial services for the poor, to assist with savings, loans and credit, is one of the Gates Foundation’s causes