Although Chapter 16 encourages us to hold our enthusiasm in check, it is clear from the evidence that I have presented in this book that IQ can improve through environmental interventions. Indeed, the Flynn effect (see Chapter 14) shows that the twentieth century was one big demonstration that improved environments can lead to higher IQ scores. As a result, some people – as demonstrated by the quote at the beginning of the chapter – believe that the changeability of IQ means that IQ can be equalized. While improvability of IQ scores – and intelligence – is possible, it is quite a different matter to make everyone’s intelligence equal.