Everything from better health data to better tax rates to... better toilets Continue reading…: Every year, Bill and Melinda Gates write a letter describing what they see in their philanthropic efforts around the world — the opportunities, the challenges, and the things that need more attention. (For 2015’s letter, Bill guest-edited The Verge.) This year, that letter is focused on things that have surprised the pair; even as the news is dominated by headlines of scandal and conflict, Bill and Melinda are focused on the many areas around the world in which innovation is driving surprising positive change.