The couple donates $1 million to support a Washington state initiative that would require criminal background checks on firearm sales at gun shows and online.
Genetically modified bananas loaded with vitamin A are scheduled to go into human trials in the US with the aim of improving nutrition in Africa.
Facebook CEO Mark Zuckerberg saw the biggest jump in wealth among all the people on the list, earning him the No. 11 spot.
Bill Gate reemerges on Reddit to share an unusual image that ties into his work through the Bill & Melinda Gates Foundation.
Now that even Tim Cook is pouring ice water over his head to support ALS, Bill Gates shows that he's still smarter than everyone else.
Stock sale puts Gates in second, behind fellow former CEO Steve Ballmer.
For the first time in four years, Microsoft's chairman beats out telecom mogul Carlos Slim. Other tech execs grace the list this year, including Ellison, Page, Bezos, Zuckerberg, and some newcomers.
Come with us on a 30-year trip through time to see how Bill Gates' baby took over the world.
Gates has granted Manchester University £62,000 to research making condoms out of a new material.
Microsoft's co-founder dishes on everything from a global condom competition to Bitcoin to his advice for aspiring computer science students.