Our science & technologies were always far ahead then what we are witnessing in the current world. We just wonder because we never read about those simply of the fact that we were never taught so. And this happened because our school curriculum always consisted of the subject matter of the then existing political parties or of the British time.
One example could be of Nalanda University, founded in the 5th Century BC & held some 10,000 students and 2000 teachers which is per records by Chinese scholar Xuanzang. The remains still can be found. The Jantar Mantar monument in Jaipur, It features the world's largest stone sundial, and is a UNESCO World Heritage site. We even had devised the deadly weapons way back to the Mahabharat Time along with time which again way back to 7500 BC that we had planes but we were taught that the planes were invented by the Write Brothers in the previous Century. Surprisingly we believe so. The curriculum must be changed with involving our pride culture.