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.
See also: Roman, Rome when in Rome do as the Romans do Follow local custom, as in Kate said they'd all be wearing shorts or blue jeans to the outdoor wedding, so when in Rome-we'll do the same . This advice allegedly was Saint Ambrose's answer to Saint Augustine when asked whether they should fast on Saturday as Romans did, or not, as in Milan. It appeared in English by about 1530 and remains so well known that it is often shortened, as in the example.