Consciousness is that something making life worth living. If we were not conscious, nothing in our lives would have a meaning or a value.

Why are we conscious? So far nobody knows the answer to this query. But as the philosopher David Chalmers explains, to find it out we will need radical ideas, which at first may seem foolish. For instance, we could conjecture that consciousness is a fundamental building block of nature. Or that it can be a universal phenomenon.