Comment by lapcat

> At 30%, one does observe a faint correlation between genetic potential and IQ. The correlation becomes clearer at 50%, while remaining quite noisy. This is an essential aspect to keep in mind: 50% may sound like a solid heritability figure, but the associated correlation is rather modest. It’s only at 80% that the picture starts to “feel like” a line.

My understanding is that the author thinks the heritability of IQ is somewhere between 30% and 50%, but not 80% or 100%, and not 20% or 0%.