Regarding the missing heritability, they are claiming that this is a deficiency of GWAS. It then goes on to talk about sequencing, which it says will find lots

Regarding the missing heritability, they are claiming that this is a deficiency of GWAS. It then goes on to talk about sequencing, which it says will find lots of evidence for miscegenation, etc. (To which I say, sure, but what of it?) In case you are not familiar with the methods, the difference between GWAS/SNP analysis and sequencing is this: GWAS relies on surveying ~500,000 (up to 6 million now, but it doesn't really matter) known single nucleotide polymorphisms. So you might ask, "which nucleotides of this subset of the human genome differ in a systematic way between cases and controls." With sequencing, you are surveying all nucleotides, not just a subset of 500,000. So you instead ask "which nucleotides out of the 3 billion (haploid) differ between cases and controls?"