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.
However, I found that the ides of April is on the 13th. In the Roman calendar, the ides falls on the 15th for March, May, July, and October, and on the 13th for all the other months. The line we know is from the Shakespeare play Julius Caesar. A soothsayer warned Caesar to Beware the Ides of March, which turned out to be the day he was assassinated by Brutus and a group of conspirators. That is why the term ides stays with us, when other Roman calendar terms, such as kalends and nones have fallen out of use.