Chance and risk
Chance events affect our everyday lives. Some things in life might be certain, like the fact that at some point you will die. but most of life's events have a lack of certainty. So whilst we know we will die, we don't know when it will happen.
So the next time you go out to the shop from home you might expect to get there and back safely, but there is a chance (however small) that you might be involved in a road traffic accident.