All animals have brains so as to be able to move about. But thinking involves the consideration of alternative responses, many of which have not been experienced but have been merely imagined. The faculty of being conscious of what is going on in the head is an extra puzzle. Then there came into being a tiny speck of superheated space that contained enough energy to create all the stars and galaxies that fill the sky-with enough left over to drive the expansion of the universe ever since. One of the intellectual triumphs of our century, which stems from what is called quantum physics, is the understanding of how very high temperatures can create matter.
Temperature is inseparable from radiation.
Even in empty space, radiation has energy, and thanks to Einstein's special theory of relativity we know that energy is equivalent to mass, or matter. Laboratory scientists have been turning electromagnetic radiation into mass since the 1930s. There is something wrong, however, with this account of how the universe began. There is not nearly enough matter in the universe to match the predictions of the Big Bang, and our current list of the particles of matter is almost certainly incomplete. There are also serious philosophical problems created by the Big Bang, which can be described but not explained.