Dear Amy: How do different types of cameras work? - Sharsta, Bendigo, Australia
Dear Sharsta: There are a few different kinds of cameras, but all are made using the same basic principles. You can learn about the parts of a camera and how they work at http://library.thinkquest.
org/28146/function.html. Another great way to learn about cameras is by making your own. Check out http://users.rcn.com/stewoody for step-by-step instructions to build a pinhole camera using an oatmeal box and other inexpensive materials.
Dear Amy: What is the difference between an alligator and a crocodile? - Drew, Boulder, Colo.
Dear Drew: Alligators and crocodiles look so similar it can be hard to tell the difference. There are a few ways to tell them apart such as the shape of the animal's jaw and teeth. Some species of crocodile can grow much larger than alligators. The saltwater crocodile can weigh up to 2,000 pounds and can grow up to 20 feet long! For more information on crocodiles and alligators, visit www.sandiegozoo.org/animalbytes/t-crocodile.html.
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