History of science and technology in Africa

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Why do certain people prefer to deny that ancient African civilizations existed? They had scientists on par with the Indian and Chinese and civilizations.
https://en.wikipedia.org/wiki/History_of_science_and_technology_in_Africa
>The Lebombo bone from the mountains between Swaziland and South Africa may be the oldest known mathematical artifact.[25] It dates from 35,000 BCE and consists of 29 distinct notches that were deliberately cut into a baboon's fibula
>According to The Universal Book of Mathematics the Lebombo bone's 29 notches suggest "it may have been used as a lunar phase counter, in which case African women may have been the first mathematicians, because keeping track of menstrual cycles requires a lunar calendar".