IQ 'can change in teenage years' (BBC News Story). Give time devoted to Ashkenazi IQ, this is interesting. as they say, "Until now the assumption has been that intellectual capacity, as measured by IQ, stays quite static during life."
... "But here we have shown that their intelligence is likely to be still developing.
... We have to be careful not to write off poorer performers at an early age when in fact their IQ may improve significantly given a few more years." Not Bad when taken in Context of Book & 1954-58 information :-D It seems to be documentation of experience described.
The real fun will come when additional R1a1 links and origins are revealed – then associated with finds in archaeology and possibly literary sources (like ancient scrolls) … which should be emerging in the next few years.