Bill Gates would rather pay for vaccines than travel to Mars

On the question of whether he is frugal in his personal life, Mr Gates said: “I don’t have a gigantic closet. I don’t wear jewellery. When I’m unwrapping a present, I don’t take the wrapping and fold it up and use it again. My grandmother never threw a paper bag in her life or any string on a package. So by her standards, I’m crazy.”