Bill and Melinda Gates give 95% of wealth to charity

Bill and Melinda Gates are one of the richest couples in the world but they've pledged to give away 95% of their fortune - so far £17 billion has gone to their charitable foundation which helps health projects across the globe.

Much of the money has been spent on vaccines against diseases like polio, malaria and HIV. They've launched Living Proof which shows the positive impact of aid projects.