The following article is longer than the ones you have read so far. After the introduction there are seven headings. List them in your exercise-book. Picking out the heading in a long article helps you to see the organization and major ideas. Headings are usually of two kinds: either they tell the main topic of a section or they simply give a small detail to catch the reader's interest. The ones that tell the main topic are the most helpful for comprehension. Most of articles from technical journals have very specific headings. In your own words, tell what you will read about in the sections that follow the headings of the article below.
