Mary Beth Griggs, Assistant Editor at Pop Science, discusses the site's latest piece on the rise in allergies and why the number of people impacted by them seems to be spiking across the U.S. We speak about peanut allergies and how the guidelines for introduction has changed. The latest research suggests parents should introduce peanuts to children between the ages of 4 and 6 months old. Before this latest development, studies suggested introduction around the age of 2 years old. Griggs tells us about how allergies tend to vary across cultures and environmental locations. The population of Australia, for example, tends to be more vulnerable. Studies have shown that if people move to Australia from countries that are low-risk, their children tend to develop allergies, suggesting allergies are a factor of environment, not genetics.