India, Sept. 13 -- Since time immemorial, there have been continuous attempts to understand human nature, human beings, their relationships, and indeed what keeps life going. A literature survey of any of these topics, singly or in togetherness, is still to be comprehensively undertaken. This makes the task of successive levels of the evolution of thought more complicated.

An example may be taken of Homo sapiens. Many definitions of what defines Homo sapiens can be found. One of the common definitions is, "man is a thinking animal." It might be asked if man is the only animal capable of thinking or if there are indeed other animals

which also think? Indeed, the definition of thinking is itself vague.

There is evidence of the ability to...