Famously, Pope Sylvester II, he was educated in Catalonia with the point of acquiring knowledge that was gained from the Arabs. Remember, the Arabs were in control, or the Islamic empires, it was not the Abbasids, it was actually the remnants of the Umayyads were in control of Spain at the time, but because of that, this area was considered a center of learning, and Pope Sylvester, who got his education there, he's the one that is often given credit for being one of the first to introduce the decimal numeral system, this Hindu-Arabic decimal system that we now use for our numeric system, as opposed to something like Roman numerals. Well, another very interesting thing is not only the word algebra comes from algebra, but the word algorithm literally comes from his name, the name al-Khwarizmi, al-Khwarizmi in Latin, they pronounce as algorithmi. So other significant contributors to the science of all of human civilization are people like al-Marwazi. Al-Marwazi, once again, in Baghdad, and he would have been a contemporary of al-Khwarizmi, and he, if you've ever taken trigonometry, or if you're about to take trigonometry, he is accredited with coming up with the core trigonometric functions. We're talking about sine, cosine. Tangent and cotangent, it might have been Marwazi, or it might have been another mathematician named al-Buzjani, who came a little bit after, or a lot, depending on a human scale, but was also based in Baghdad.