text: Most students are not nessisarly excited about school so they quite regularly wear a bored expression throughout the day. Not to mention "each expression is compared against a neutral face (showing no expression)". Some kids just do not show emotion especialy older kids who just want to get what needs to be done finished. What if a kid is genuinly confussed and the computre missreads the expression. that could either cause more confussion as the lesson goes on or make the lesson too easy.