The caste system in India divides Hindus into four main categories - Brahmins, Kshatriyas, Vaishyas and the Shudras. The main castes were further divided into about 3,000 castes and 25,000 sub-castes, each based on their specific occupation.
Indica is the book written by Greek historian "Megasthenes" in which he described India like how is the Indians life, what way of life is followed, etc...
Which country successfully launched the first high-throughput communication satellite "Shijian-13" which will enable passengers of high-speed trains to watch high-definition videos smoothly and help those at the scene of natural disasters ?