The CIA World Factbook elucidates lots of data and figures for all the countries of the planet. It includes a short description of the socio-political history, economy and geographical features for them. The data spans literacy figures, infant mortality rate to oil proudction, GDP and defence expenditure.
It was interesting to note some of the figures for India and China. They tell quite a story.
Like the median age for India is 24 years whereas for China it is 31 years. In the coming 6-7 years, India will have far more younger workforce than China.