The United States has been inoculating children between the ages of 5 and 11. It says the advantages outweigh the risks. Critics say there’s not enough data to be sure. Most schools around the world have re-opened. And the rate of infection among children is rising rapidly. Masks could protect pupils. Some people reject that, arguing that masks can inhibit a child's learning. Why is it so tricky to find the right solution for kids? What do we know about kids when it comes to COVID-19? Should they wear masks or get vaccinated?