A simple wave of the hand can boost a child’s performance in mathematics. A new study published in Child Development found that students perform better when instructors teach with hand gestures—something that teachers in the United States do less commonly than teachers in other parts of the world.
In a test given immediately afterward, students who observed the gestures performed better. A second test, 24 hours later, also showed that the gestured-to students had an edge over the other group.
Linda Poon, National Geographic News, April 7, 2013