Billionaire Microsoft co-founder Bill Gates said Wednesday that he plans to give his wealth to his foundation. In a Twitter thread that doesn’t allow replies, Gates announced he was transferring $20 billion to the Bill and Melinda Gates Foundation’s endowment this month and will increase spending to $9 billion per year by 2026. “As I look to the future, I plan to give virtually all of my wealth to the foundation,” Gates wrote. “I will move down and eventually off of the list of the world’s richest people.” Gates is currently the fourth-richest person on earth and has a net...