so all science comes from europe or the west... right. you are a fool.
i will name 2 things: abacus & black powder
i still want to know, why there is not black african sciences around this today, what is stopping them now and did previously.
your eurocentric argument means that a new word needs to be created for "science in africa".
You can equally ask why didn't they invent the wheel.
To be fair though, there is some evidence of mathematics (other than just counting), and the knowledge of how to smelt metals passed down through Africa from the Mediterranean.
The wheel question is valid though - there were surely enough escaped slaves from the Arab world who observed various advances such as carts etc. and enough time to transmit the knowledge throughout Africa just as metal working did.
The ruins at Zimbabwe indicate at some point someone figured out how to put one stone on top of another but how or why that knowledge was there for a brief period and then disappeared while everyone else continued to live in mud huts is a mystery that may never be solved.
FYI if we are talking about decolonising Africa - we mustn't forget Zulu beadwork should go (slave trade beads originally) and Venda huts - paint was introduced by us terrible colonisers in the 1930's I think (fact check needed). Although they were painting with ocher before that, all the colours, and several of the designs are Western in origin.
Oh and while we are at it - shweshwe cloth and Swazi blankets (both trade cloth) need to go as well.
If you are going to be so militant about something you don't get to cherry pick what you want to keep.
Sadly however the truth is that this not what they actually want. If you suggested this the #fallers would freak out of their tiny brains. It is at the heart racist hate speech against Whites and the West. I don't want to speculate or indulge in theories as to what the root is, or what the ultimate goal is, but one thing I am sure of - getting rid of the conveniences of the West is not on the agenda.