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.
The co-founder of Microsoft and his wife donated $2.65 billion last year in an effort to combat deadly diseases around the world.
Facebook CEO Mark Zuckerberg saw the biggest jump in wealth among all the people on the list, earning him the No. 11 spot.
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.
Bill Gate reemerges on Reddit to share an unusual image that ties into his work through the Bill & Melinda Gates Foundation.
Stock sale puts Gates in second, behind fellow former CEO Steve Ballmer.
The streaming music service introduces a plan that allows up to five family members to have separate premium accounts on one bill.
Gates has granted Manchester University £62,000 to research making condoms out of a new material.
It seems that the Microsoft chairman would like Facebook and Google billionaires to pay attention to eliminating diseases afflicting the poor, in addition to wiring up the planet.
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.