In the World Happiness Report’s annual ranking of the happiest countries, the U.S. dropped to No. 24, its lowest position in the list’s 13-year history. Last year, the U.S. dropped out of the top 20 for the first time. The list is compiled from analysis of how a representative sample of residents from over 140 countries rate their quality of life.

Child concentration issues in school can happen to many students. Most children have trouble paying attention in class at some point. When this happens, especially with young students, parents wonder why their child can’t focus and whether their child might have a learning difficulty.