This Topic in Depth explores the basics and uses of chlorine. Provided by the Environmental Protection Agency, the first site is called Chlorine Bleach (1). The page briefly describes what chlorine bleach is, what's in it, and related health and safety concerns. The next site is maintained by WebElements.com and is called Chlorine (2). Visitors learn the element's symbol, atomic weight, its uses, and all of its physical and nuclear properties. Next, from poolcenter.com, comes the Chlorine Chemistry (3) Web site. Ten questions related to chlorine are answered such as What's the History of Chlorine, How Does Chlorine Work to Sanitize, and What Effect Does pH Have on Chlorine. Each is briefly explained in simple and non-technical language. The fourth site is another great offering from HowStufffWorks.com that answers questions about chlorine on their Question of the Day (4) page. It discusses how chlorine removes stains, whether chlorine bleach is the same as chlorine in drinking water and swimming pools, and if it's safe to use. The next site is provided by the Chlorine Chemistry Council and is entitled Chlorine's Everyday Uses (5). The page contains several links that address the uses of chlorine with titles including Chlorine Chemistry's Role in Our Daily Lives, Chlorine's Contribution to National Security, and Chlorine: Beneficial Products. A very interesting and surprising set of documents that will make you think of chlorine in a whole new light. The sixth site, which is called Chlorine in Industry (6), is provided by Euro Chlor. The site discusses how chlorine is vital for many processes, how it is made, and even the socioeconomic importance of chlorine. Bradfield College's Department of Chemistry offers the next site, again simply called Chlorine (7). This informative site explorers the structure and bonding of chlorine, its uses, properties, related environmental issues, and more. The last site is provided by the Science Center called Chlorine Experiments (8). The first experiment is called Sunscreen and Light Energy, which shows how chlorine is an ingredient in sunscreen and how it helps protect people from the sun's damage. The other experiment, called Antifreeze and the Freezing Point of Water, teaches how chlorine is an important component in antifreeze. Using antifreeze, foam cups, glass vials, and other simple ingredients, students learn how the liquid helps keep cars and other engines running during winter.