Quote:
Originally Posted by Ramrod
Go on then. Enlighten me. 
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in short some of the caliphates of the old Islamic world were particularly unsavoury, preaching hate and intolerance towards anyone within their spheres of influence (eg. Christian groups within Persia as was) who didn't tow their line. Familiar?
A certain Genghis Khan as we know him took particular exception to practices of religious intolerance so he and some of his descendants all but annihilated said perpetrators who were unfortunate enough to be in the path of the Mongol hordes.
Consequently much of the scientific knowledge and advancement within that particular cultre gained over the centuries came to an abrupt halt.