The foundation turns 25 years old this year, and to celebrate the occasion, I've made a big announcement: I will give away virtually all my wealth through the Gates Foundation over the next 20 years to the cause of saving and improving lives around the world. The exact amount will depend on the markets and inflation, but I expect the foundation will spend more than $200 billion between now and 2045. 

To mark this milestone, I’ve taken a closer look at the breakthrough that reshaped how the world understands child mortality—and at the new tools that could help millions more babies and mothers survive in the years ahead. I’m excited to see how this next chapter continues to move the world closer to a future where everyone everywhere has the chance to live a healthy and productive life.