by Sue-Lynn Moses

Good Ventures, the foundation of Facebook cofounder Dustin Moskovitz and his wife Cari Tuna, is only a few years old, and it's already made some big bets, most notably on GiveDirectly, which touts direct cash assistance as the best answer to poverty. But the foundation remains a work in progress with a wandering eye. And that's a good thing, because it means that it's open to new areas of grantmaking—like fighting iodine deficiency, a crucial global health issue that often gets ignored by funders...