[Gengis Khan]

When Mamun traded gifts with other states, he gave riches and asked for philosophy books in return (thus gaining possession of the works of Aristotle, Plato, etc.).

 

Read Fibonacci's bio, that's what happened

 

And what I am argueing is that Muslims merely passed on the science of the east to those of the west. That does not make them inventors of those sciences although they very much claim credit for having invented them.

 

However, they never made it back (no Eastbound current there), so it's not much more than a historical footnote.

 

If they never made it back how do you know they reached the Americas in the first place?

[antiRepublicrat]

And what I am argueing is that Muslims merely passed on the science of the east to those of the west.

They nurtured what was there, helped it advance. Otherwise you'd have seen discoveries go down after the 7th Century instead of up.

If they never made it back how do you know they reached the Americas in the first place?

It is known that Abubakar equipped about 400 long boats, half for provisions to last a very long time, to try to cross the atlantic. One ship came back saying the others had been taken on a fast Western current (Northern Equatorial, Mali was at the Eastern end of it). Abubakar then set out himself with about 2,000 long boats, again half for provisions. Nobody saw him again, making Mansa Musa king. There is a lot of archaeological evidence in the Americas to show they probably made it, stuff with obviously African influences, such as the long boats, carvings and mostly black settlements.

BTW, Mansa Musa is himself famous for causing a gold market crash due to his exhorbitant spending on the way to the Hajj.