How the world power after 2020 will be decided by the ability of a country or a group of countries to produce bio weapons and also on their ability how to save their population from bio weapons of their own and others.
It is said that most wars are in some ways demonstration of technologies of a warring party more than cultural, monetary or social superiority. In all wars, a side with superior technology and understanding of science has usually won 9 times out of 10 since time immemorial. In that context, the World war 2 was started and fought