People living on the edge of African nature preserves can pass their diseases to gorillas living there. In this episode of Constant Wonder, a wildlife vet practices "One Health" by investing in the health and economic security of humans to ensure primates stay healthy, too. The result is robust gorilla tourism that benefits the entire country. Guest: Dr. Gladys Kalema-Zikusoka, founder and CEO of Conservation Through Public Health and author of "Walking with Gorillas: The Journey of an African Wildlife Vet" Photo credit: Jo-Anne McArthur / #unboundproject / We Animals Media