1. No evidence of shortages of scientists or engineers
No one who has come to the question with an open mind has been able to find any objective data suggesting general “shortages” of scientists and engineers. The RAND Corporation has conducted several studies of this subject; its conclusions go further than my summary above, saying that not only could they not find any evidence of shortages, but that instead the evidence is more suggestive of surpluses.
"I would add here that these findings of no general shortage are entirely consistent with isolated shortages of skilled people in narrow fields or in specific technologies that are quite new or growing explosively."