It is easy to identify a main idea that is directly expressed in the text. Main ideas are often found at the beginning of paragraphs. The first sentence often explains the subject being discussed in the passage. Main ideas are also found in the concluding sentences of a paragraph.
Scientific American is the longest persistently distributed magazine in the U.S. Ithas been bringing its perusers one of a kind experiences about advancements in science and innovation for over 170 years.
