1) Greeks learned from hindus. -- All the greek gods and godesses, starts comets, constellation, astrology were all in india. India has been the teacher of greeks.
2)Before islam, hindus wee teacher of arabs.
3)biggest sanskrit library is in england and germany.
Before romans knew of 0, they could count up to only 1000 = M , which is represented by an M. With 0 their real development started.
Sanskrit is the oldest and most pious language to represent knowledge. Sanskrit is the only language of divine origin created by brahma(the creator god).