Translation of por cierto

We can recognize the facts and how they are. So we might observe a lot of things but we will never understand, we will never know why the flower is red, what brought the little aninal to that height.
Please postpone by three days to one week. I am abroad, and Loraine can't come with the baby. We are available from august 31 until September 23 (except September 16) where we have other commitments.
Anyway, on our last day in Sapa, we hired a taxi driver, payed him twenty dollars and asked him to drive us around for a few hours. We had the Tram Ton pass in mind which separated two climate regions.