Robert Rosenthal, from Harvard, designed an experiment. In it, he told teachers that, after a special IQ test, a few students were expected to experience an increase in IQ. Low and behold, they did!
"As Rosenthal did more research, he found that expectations affect teachers’ moment-to-moment interactions with the children they teach in a thousand almost invisible ways. Teachers give the students that they expect to succeed more time to answer questions, more specific feedback, and more approval: They consistently touch, nod and smile at those kids more."Over time, these small actions make a significant impact on those students.
As a result of this research, I'm going to smile and nod uncontrollably at a few kids in my class. Once they've reached a respectable IQ, I'm going to smile and nod uncontrollably at all of the kids in my class. Take that, low IQ!