Transcript: Nature exhibits certain coincidences that physical scientists have to take note of. Even if the physical laws of nature are described by an as yet unknown fundamental physical theory, we have to be able to understand why the forces of nature are the way they are, why they masses of fundamental particles are the way they are. Normally, this would not be a cause for interest when considering life in the universe, but it turns out that many of the physical properties of the universe we live in are finely tuned and in such a way as to be propitious for the existence of biological life. Is this a coincidence, or was this built into nature somehow? The second possibility is called the argument from design. It’s actually been criticized by philosophers as famous as Bertrand Russell, but still we are left with the fact of we have to explain the properties of our universe and the fact that they happen to be propitious for life.