In genius studies, Platt IQs are IQs intuited by American John Platt, a child prodigy turned physicist, biophysicist, social thermodynamicist, and reductionism defender, and genius studies scholar.

List
The following are the 12 Platt IQs, according to the Platt's ranking scheme:

IQ JPPlatt IQ scale



190Newton, Gauss, Archimedes
180+Einstein, Pasteur
180Neumann, Pauling, Bridgman, Russell, Freud, Darwin, Shaw
→ Mycroft Holmes [fictional genius]

170about 300 existive Americans (out of a 1962 population of 187 million)
→ Sherlock Holmes [fictional genius]

160about 5,000 existive Americans (out of a 1962 population of 187 million)
150about 100,000 existive Americans (out of a 1962 population of 187 million)
140about 1,000,000 existive Americans (out of a 1962 population of 187 million)
→ Inspector Lestrade [fictional genius] (Ѻ); equivalent to someone with a PhD

100average adult
70a moron
40an adult chimpanzee, six-year-old human

The article seems to have been reprinted in Platt's 1962 The Excitement of Science. [4]

Cox-Platt-Platt IQs
The following are is the mean IQs of the geniuses common to the Cox IQs (1926), Platt IQs (1962), and Buzan IQs (1994):



Cox IQ
(1926)		Platt IQ
(1962)		Buzan IQ
(1994)		Mean

--------------------------------------
-------------------
--------------------
-----------------------


1.Isaac Newton190190195188
2.Carl Gauss190



3.Archimedes190
190

4.Albert Einstein
180+205

5.Louis Pasteur

180

6.John Neumann

180

7.Linus Pauling

180

8.Percy Bridgman

180

9.Bertrand Russell

180

10.Sigmund Freud

180

11.Charles Darwin165173180173
12.Bernard Shaw

180


Here, of curiosity, we see only two geniuses, namely Newton (mean IQ: 188) and Darwin (mean IQ:173), common to the 300 Cox geniuses, the 11 Platt geniuses, and the 100 Buzan geniuses, and two geniuses, namely Archimedes (mean IQ: 190) and Einstein (mean IQ: 195) (note: used "185" as Platt measurement for Einstein's IQ), common to two..

Quotes
The following are related quotes:

“There is an apocryphal story physicists tell [see: fly bicycle problem] about the late John Neumann—probably a 180—that shows the difference they feel between such really high-speed minds and those of ordinary brilliance. In mental ability, an adult chimpanzee can solve mechanical problems about as well as a six-year-old child. This ape might be given an IQ of about 40. A moron would be around 70, an average adult 100, a PhD 140, an Einstein 180 or better. The hardest problems can be solved only by men of the greatest ability, and brilliant men are few. The second hard fact about the IQ scale is that there are not very many brilliant men at the top of it. At the 190 level, which might describe Archimedes, Newton, and Gauss, we have been seeing about one every five hundred years. A Newton at the 190 level occurs once in 500 years. At the 180 level of Darwin, Freud, Shaw, Bertrand Russell, Percy Bridgman, Linus Pauling, there might be a dozen living Americans. There are some 300 at 170 in the US, 5,000 at 160, about 100,000 at 150, and one million at 140.”
— John Platt (162), “The Coming Generation of Genius: an ‘Explosion’ of 180-IQ boys. And Girls?” [1]

See also
● Buzan IQ
● Cox IQ
● Cox-Buzan IQ

References
1. Platt, John R. (1962). “The Coming Generation of Genius: an ‘Explosion’ of 180-IQ boys. And Girls?” (Ѻ)(Ѻ)(Ѻ)(Ѻ), Horizon, 4(4):70-76.

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