I'm Bill Gates, join me in Africa to see some little things that are making a big difference improving our world. Look around this kitchen. There's an innovation improving health for this family. Need a hint? It prevents birth defects, and it helps kids do better in school. See the bag of flour by the stove? The Global Alliance for Improved Nutrition, or GAIN, works with the government to end malnutrition by mandating healthier food products like fortified flour. Nutrient enhanced foods prevent birth defects and improve learning. In this clinic, a new innovation is helping protect healthy people from HIV infection. It lets you know if you're forgetful, and it's small enough to fit into your pocket. That small black box is an electronic pill dispenser called the Wisepill. It lets doctors track if patients are taking their medication, and it sends a text if a patient forgets a pill. It can help at-risk patients using a pill called Truvada, that taken daily, can prevent new HIV infection. 20% of vaccines spoil before they can be used, but there's an innovative solution. Can you find it? It uses the same technology found on spacecraft, and it doesn't use electricity. Give up? Look straight down. That cylinder below is the Arktek Cooler. A low-maintenance, easy-to-use refrigerator. It can keep a supply of vaccines cool for a village of 6,000 people for a month. Inside this tiny village shop, there's a simple tool helping small-scale farmers to thrive. It helps farmers buy seeds and fertilizer, and it's small enough to fit in a wallet. It's a myAgro scratch card. These cards allow farmers to make layaway payments to afford large purchases. It's a safe, easy, and debt-free way for farmers to invest in their crops and lift themselves from poverty. Something on this farm can help lift families out of extreme poverty. Can you see it? It generates income, and you can have it for dinner. It's not a piece of technology this time, it's the chickens! For a farmer in a developing country, allocating a part of their farm to raising chickens can double the economic return on their land.