Natural science can be broken into two main branches: life science (or biological science) and physical science. Physical science is further broken down into branches, including physics, astronomy, chemistry, and Earth science. All of these branches of natural science are divided into many further specialized branches (also known as fields), and each of these is known as a natural science.
When in Rome, do as the Romans do definition When visiting a foreign land, follow the customs of those who live in it. It can also mean that when you are in an unfamiliar situation, you should follow the lead of those who know the ropes.
The Romans had a policy of letting people keep their own traditions and culture. In other words, instead of conquering an area, teaching them Roman ways and religion, and forcing their new people to be more Roman they merely made the conquered people swear fealty to Rome and then pretty much left them alone.