In an experiment, researchers showed more than a dozen portraits of similarly well-dressed children to a panel of doctors and teachers who had to judge the intelligence of the children based on the portrait photos. The results of this subjective judgment will be compared with the results of the objective intelligence test. Finally, the researchers concluded that people can judge an individual's IQ by being ugly.
If a person is good-looking, we may mistakenly think that he must be very intelligent, which can weaken the above conclusion most.