I'm glad you posted this. Sometimes I try to describe this gfactor to people, saying "the best indicator of intelligence is any other intelligence". Putting a

I'm glad you posted this. Sometimes I try to describe this gfactor to people, saying "the best indicator of intelligence is any other intelligence". Putting a name on things helps people understand I am not a total bullshiter. Why do you say that this is a common belief that used to be true, but is now no longer true?