100 IQ - Can engage in casual conversation with most, if not all other people (except those who are particularly dull - less than 85 IQ). Can memorize and repeat information effectively, without necessarily understanding what they are saying. This is why actors can play particularly intelligent characters, without being highly intelligent themselves. People at this level of intelligence are basically memorizers, who can learn and carry out a set of instructions, and even repeat them to others. This is not to say they are totally incapable of critical or original thought (that would put them at about 85 IQ if that were true), but the level of depth at which they can analyze and synthesize is not impressive, nor underwhelming.120 IQ - Again, conversing with others on casual topics is no issue, but every now and then they might make a baffling comment about a show or sport that leaves others trying to understand what they mean, or how they possibly came up with it. Pretty much have an advanced ability when it comes to analyzing, understanding and interpreting information, when compared to averaged intellects. Synthesizing material may not be their forte, but is still slightly better than 100 IQ. Due to their increased processing, understanding and retention of information, these individuals will likely have a higher level of formal education and income when compared to those in the average bracket. Most (Iu2019ve talked to) agree that this range of intelligence is a pleasant niche to fill, as it doesnu2019t leave you disassociated socially and allows for a challenge and drive in education.130 IQ, and where Iu2019m going to end the bracket as my personal experience ends here -This next paragraph comes from personal experience so please excuse any cynicism.Casual conversations are beginning to become dull at this range. Probably depends on how willing/interested you are in trivial topics like pop-culture and movies. But most intelligent people I know suck at talking about anything other than topics perceived as meaningful and engaging to them, and due to the nature of what is engaging to these individuals, casual conversation is rarely a comfortable place for them. Analyzing information is breezy, but only if weu2019re given the foundational knowledge that allows us to make the links, otherwise we either become stubborn and donu2019t want to hear any more, or we absolutely have to find out every single linking detail for ourselves, thus making learning a fairly tangential process. Processing is also fairly quick, which is a given. Synthesis of information is where differences from average intelligence become obvious here. An individual with 130 IQ should be able to learn something, and theorize effectively about its worldly influences, or form bonds between multiple sets of ideas which are logical and accurate, which others couldnu2019t even see being possible. Despite this ability to synthesize their own theories about subjects, they still canu2019t test their theory mentally like those who are smarter can. An individual with 130 IQ will have to test a theory in order to prove it, whereas an individual even smarter will be able to accept or dismiss it based purely on logical applications made mentally. Which brings me to application - no one below 150 IQ can conduct mental experiments. Everyone below 150 IQ sucks at the application of complex real-world theories mentally.I hope this gave you a general idea. Cheers!EDIT: Thankyou to Peer Landa for the edits, although I do tend to prefer the British u2018Memoriseu2023 and u2018Theoriseu2023 to the American alternatives, as I am Australian and speak in the archaic lexicon.