Billionaire Bill Gates, chairman and founder of Microsoft Corp, and his wife Melinda attend the Allen & Company Sun Valley Conference in Sun Valley, Idaho on July 11, 2015. AFP
Agence France-Presse is an international news agency headquartered in Paris, France.
What you need to know:
They married in 1994 and had three children. Before he popped the question, Melinda says she caught Bill weighing the decision by writing out the pros and cons of marriage on a white board
