Quantifying 'smartness' is no easy task. In fact, even the most common measure we use to quantify a person's intelligence - the IQ test - has been subject to a whole lot of scrutiny over the past few years, with research suggesting that a person's IQ score doesn't actually mean anything. "There is no such thing as a single measure of IQ or a measure of general intelligence," a team from the University of Ontario in Canada concluded in 2012. "When we looked at the data, the bottom line is [that] the whole concept of IQ - or of you having a higher IQ than me - is a myth.