Confucious said that real knowledge is knowing the extent of one's ignorance.Aristotle and Socrates said the same thing.Is it a skill that can be taught or learned? It probably can, if you have enough of a stake riding on the outcome...
The greatest thing to come out of my country is not Ganges water, or the Taj Mahal, or the Himalayas, but the fact that it is the world's largest democracy.
