And the question is, is how does a given cell actually know to carry out a specific set of processes at a given time? So to demonstrate what I mean by that, let's imagine the following scenario and we're going to use this scenario as we go along this lecture. So let's suppose I'm walking in the national park and I come across a bear and that bear happens to be hungry. Now, if the bear is that size I'm clearly not going to run away. But if the bear is a large bear and if I panic I'm going to run. Now, when I run, what happens inside my body?