Genuine racism question

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Newfag here (2 years on 4chan). I'm posting this on /sci/ because i think scientists and sci enthusiastics should be the least biased people alive.
I read a book of 300~ pages yesterday in a single sitting after several years whitout reading one. It was a summarize about homo sapiens first records to modern times.
The author claims that races between humans have many difereences, just like /pol/ does, buy with so many shills and shitposting there it's hard to trust them on that subject.
Is it straight right wing propaganda or there is actual scientific backing for that?
Would /sci/ redpill me on this subject with scientific data?