instead of passively absorbing data, teachers made it “disfluent”—harder to process at first, but stickier once it was really understood.
Charles Duhigg • Smarter Faster Better: The Transformative Power of Real Productivity
Verbs come in two types, active and passive. With an active verb, the subject of the sentence is doing something. With a passive verb, something is being done to the subject of the sentence.