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Source: Youtube.com
I'm quite surprised to hear that Mr Rushton's work has been suppressed! In a world not hyper sensitive about race then he would have won awards for this! A 30-33 point IQ difference between blacks and whites, or 15 points for African Americans and whites.
The abridged version & audio abridged: Archive.org
John Philippe Rushton - 'Is race a valid taxonomic construct ?' - Balderexlibris.com
and full version:
Race, Evolution, and Behavior: A Life History Perspective [2nd Unabridged Edition] (1997) by John Philippe Rushton (PDF, 27.3 MB)
Docs.google.com
Mediafire.com
The g Factor: The Science of Mental Ability (1998) by Arthur Robert Jensen (PDF, 51.6 MB)
Docs.google.com
Mediafire.com
The reference to brain size/weight was not mentioned but I found it, basically Africans have on average 100 grams less brain matter than Whites (a quarter pound). Researchgate.net
more on brain size: Philipperushton.net
see also:
Stephen Molyneux r/k selection theory series: Youtube.com
Prof. Philippe Rushton 'The American Race Dilemma in World Perspective' - Youtube.com