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This Topic in Depth begins with a Web site from the Stanford Linear Accelerator Center called Theory: Quarks (1). The one-page offering contains a basic explanation of what quarks are, their masses, and how they're known to be real. Critical words within the page, such as flavor and hadron, are linked to a handy online glossary of terms. The second site is presented by the Particle Data Group of Lawrence Berkeley National Laboratory. Called The Particle Adventure (2), this extensive Web site provides visitors an interactive tour on quarks, neutrinos, antimatter, and much more. Users can choose from the numerous topics within the table of contents on the left, or simply click the right arrow at the top of the screen to navigate page by page through the well conceived site. Next, from the American Institute of Physics Science Report Radio show, an episode entitled What Makes a Quark? (3). The program, which has a person explaining the basics of quarks to another person, can be downloaded in various formats, making this a unique and interesting online source. The fourth site, provided by ScienceNet.org, presents a nontechnical lesson called Quarks (4). From the first page, which explains where quarks got their "funny name" to many other topics, the site gives basic descriptions and illustrations to help students better understand this difficult subject. Next, from Cornell Universities Floyd R. Newman Laboratory of Nuclear Studies, comes the Particle Physics (5) Web site. Visitors get to view a QuickTime movie of matter and antimatter meeting called annihilation. The rest of the page describes what happens in the animation and further explains quarks and other particles. The sixth site, offered by the Fermilab Education Office is a lesson called Calculate the Top Quark Mass (6). Students "use Einstein's famous equation and actual experimental data collected to determine the mass of the top quark; which is the most massive quark ever discovered." The lesson includes illustrations, an animation, and several thinking questions to help reinforce the learning. Next is the Particle Physics Picture Index (7), offered by the Particle Physics in the UK Web site. The page contains a picture of a quark starburst, the missing neutrino, looking deep into a proton, etc., as well as links to three other pages with similar items. The last site, called QuarkDance (8), is more of an amusement, but does contain links to quark related sites worth a visit.
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