&gt; Medical technology has yet to make any impact on human intelligence.<p>But stay tuned! Human intelligence is now modifiable. Preimplantation genetic diagnosis has been done for a while, and increasingly is done with SNP arrays. That means you can use the polygenic scores from past GWAS studies on intelligence. I&#x27;ve been modeling this, and with a fairly realistic model of how IVF &amp; PGD works and the best current polygenic score publicly available, an American could expect a gain of ~0.2 IQ points right now if they used PGD to select for intelligence, which is potentially cost-effective even. This will go up as additional GWASes come out (SSGAC has one coming out soon which should at least double the gain).<p>More strikingly: CRISPR has already been used to edit human embryos fairly successfully. Once CRISPR is finetuned to the point of being safe enough to use for 1 edit, as the several planned human trials point to being the case now or very shortly, then 1 edit will buy you 0.5 IQ points (the effect of the largest identified gene), and as CRISPR improves linearly, the gains will scale nicely with the number of edits you can do; progress in CRISPR is so fast that it may be able to go from &#x27;irrelevant&#x27; to &#x27;game-changer&#x27; in a few years, somewhat like the NN Go players recently went from &#x27;terrible&#x27; to &#x27;amazing&#x27; just a year or two by constant improvement.<p>(In contrast, embryo selection is easy to implement technically, but highly limited in its potential power because you turn out to be bottlenecked by how many eggs you can extract from a woman and how many of them will survive fertilization and implantation to yield a live birth.)