Children aged four to six were studied to see if they choose actions that help them learn about cause and effect. They were given a task with gears and had to decide which gear to remove to understand how the gears work together. The children mostly picked the gear that would give them the most information about how the gears interact. Even when the chosen action didn't lead to a fun outcome, the children still made choices that helped them learn. This shows that kids can make smart decisions to figure out how things work, even at a young age.