Homeschooled with MIT courses at 5, accepted to MIT at 15
Even with all the positive support from parents this kid is an extreme outlier.Terrence Tao supposedly knew numbers from Sesame Street at age 2, but I do not know of any avid kid readers at age 2.I know plenty of kids ages 3-4 who know the alphabet but none are actual readers.In fact I know plenty of kids who "read" a book at age 3, but they are not reading the way we adults are they are imitating the reading process.Anecdotally I was a relatively early reader at age 5 (reading whole scary Grimm's tales) but my mom keeps insisting it was age 3 when I know it was not.So if he really was reading at age 2 and half that is showing   advanced potential.