Topic: 4) A Random Walk
This is heartwarming stuff. I am very touched that Bill Gates (via The Bill and Melinda Gates Foundation) is spending much more money on vaccinating the world's young ones as opposed to vaccinating computers. The numbers are sometimes hard to grasp when talking about numbers this large, but if you can imagine cities and cities of people all being all infants, this money enables vaccination of that many kids. The population of the entire United States is 290 millionish.