I was thinking about this for a while. How do you measure the present? There is no unit small enough to measure now. Maybe that is because what we think of "now" is just a matter of perception. When I started to write this message that was the present at the time. When someone reads my message that will be the present as well. So really all the present is, is the moment the future becomes the past. Because of this, would it really be possible to travel through time when you could never pinpoint an exact time to go to because there really is no way of measuring when that time would be? Just a thought? What do you think?