"When you first step into a classroom, poised and ready to launch into a new discussion or lesson, you probably feel a sense of excitement. You’re about to embark on a journey with your class and every student is along for the ride.
The problem, however, is that many students are not on the same page. Some are more prepared than others. Some are light years ahead, in fact. Then there are many students who have no prior knowledge and it’ll take a little extra time to get up to speed."
Via John Evans