Classroom Exercise - Do This Now: On a single piece of paper:

1. Write down your estimate of how much longer the human species will be able to survive on planet earth.

2. Do you believe that eventually we will colonize other worlds in our Galaxy?

3. Do you believe that intelligent life exists on other planets in the Galaxy?

Don't put your name on this and please hand it in to the professor to again see what the class concensus is.