Through my book India, I made the Arab world familiar with Hindu mathematics and culture.
My two favorite things to do were traveling and thinking about complicated ideas.
I wrote one of the first critical accounts of the Siddhantas and what is now known as the positional place value system.
In my texts, I both confirmed that Archimedes knew about Heron's formula and proved Brahmagupta's formula using a trig formula for cos(3x).
I published an account on gnomen lengths as a part of Hindu shadow reckoning.
Finally, in addition to dabbling in gravitational physics, I posed the possibility of the earth rotating on an axis.
Abu Rayhan al-Biruni (973-1048)