"There are some people who claim that Ayurveda is the oldest medical system, but from the research done with the help of available historical data, it is evident that Siddha system of medicine is much older and has more history than even Ayurveda. Not only is this medical system the oldest, this is a medical system with lots of specialities; its specialities far outweigh the Ayurvedic medicine" Thanks to the authors team from  Pt. Ravishankar Shukla University, Raipur, India for the nice article on  "Fundamental Aspect and Basic Concept of Siddha Medicines"  http://www.sysrevpharm.org/article/42