Richard Lynn was right. If only he could measure integrity and honesty, then indians would occupied the bottom cellar as well.
Egyptian, Greeks and Chinese maths were developed in the BC era. Indian has no advanced math until Greek invasion. Your trigonometry ......were all based on Greek's. You were the biggest plagiarizer of ancient times, much like how your bollywood, the largest film industry is the biggest copycat of Hollywood
Your significant math came only in Gupta era during 700 AD. You were late by 1000 years compared to Greek and Chinese.
Zero the most useful contribution?
Your brahmagupta completely messed the notion of zero, he was diving numbers with ZERO.
He even assigned a positive and negative to ZERO
It took Newton to correct it, almost 1000 years later.
Now go take your PISA, then come to China to learn what is called honesty.
In summary,
The world had progressed for 4000 years before this country called India was created in 1947. India is completely inconsequential in the world of civilization, the only exception is in the intangible stuff: Religion and mythology story-telling are your only major contributions. Even then, you're losing it, your movies industry had to shamelessly copy Hollywood? You can't even write your own script.
Let's not even go into indian using chinese made electronics and called Made in India.