Bill and Melinda Gates' pledge to 'the poorest'
18 October 2010 Last updated at 10:10 BST
One of the richest couples in the world, Bill and Melinda Gates, have said they are committed to helping with ''the diseases of the poorest''.
They have pledged to give away 95 per cent of their fortune and have so far donated £17bn pounds to health projects across the globe.
Much of the money has been spent on vaccines against diseases like polio, malaria and HIV.
Bill and Melinda Gates are in the UK to launch their Living Proof programme, which shows the positive impact of aid projects like theirs.