The boundary condition of the universe is that it has no boundary.

I'm here to chew gum and kick some ass, and I'm all out of gum.

It matters if you don't just give up.

The increase of disorder or entropy with time is one example of what is called an arrow of time, something that distinguishes the past from the future, giving a direction to time.

Gravity is so strong that space is bent round onto itself, making it rather like the surface of the earth. If one keeps traveling in a certain direction on the surface of the earth, one never comes up against an impassable barrier or falls over the edge, but eventually comes back to where one started.

Disorder increases with time because we measure time in the direction in which disorder increases.

Our population and our use of the finite resources of planet Earth are growing exponentially, along with our technical ability to change the environment for good or ill.