There are many unknown facts about the achievements of India, in the field of Science and Technology. http://www.indianscience.org/dyk/t_dy_Q14.shtml The given link could not be highlighted despite best efforts. Readers may please copy the link and paste on the Google.Sorry for the inconvenience.
The link is now highlighted. This is about small pox.
G. K. Ajmani Tax consultant
Thank you said by: rambabu