Skeptic

I count myself a skeptic but not a denyer.

A firmly believe there are millions (or more) intelligent species in the universe.

My doubt stems from a few things based on our current understanding of physics.

Distance v time to traverse- How long civilization lasts- Physical attributes (certain technologies may not be obtained by a species who live under water. What do dolphins know of fire?)- Speed of light barrier – Discovering each other- Motive to visit- Costs-