Bill Gates says a deadly flu epidemic is one of the biggest threats to humanity. It could kill nearly 33 million people in 6 months.

JP Yim / Getty Bill Gates released his annual "What I learned at work this year" letter, which reflects on the issues of the past year and predicts what may happen in the upcoming 12 months. In his 2018 edition, the Microsoft founder shared what he believes will be the next epidemic: the flu. "If anything is going to kill tens of millions of people in a short time, it will probably be a global epidemic. And the disease would most likely be a form of the flu," Gates wrote. Gates added that develo...