Q: You can cook bread, pizzas, cakes, and other desserts in your Dutch oven by placing hot coals on top of the lid and underneath the Dutch oven full of food. To bake, you should place more coals on top of the lid than underneath the Dutch oven. This will prevent food on the bottom from burning. Consider your Dutch oven's diameter. To figure how many charcoal briquette coals to put on top, add 3 to the diameter. To determine the bottom number, subtract 3. For example, if you have a 12 inch Dutch oven, you'd need 15 coals on top and 9 on the bottom. Since you're trying to heat water or a liquid like stew, you should place all of the hot coals underneath your Dutch oven. This will quickly concentrate the heat near the bottom of the pot. You should also place all the coals underneath the Dutch oven if you'd like to use it for frying food. While you can use the lid when bringing your food or water to a boil, you shouldn't put coals on top of the lid. Having hot coals on the lid of a Dutch oven full of boiling liquid could be dangerous and difficult to remove. If you want to quickly fry up breakfast, turn the lid upside down and place it directly on hot coals. Watch the food to make sure it cooks completely and doesn't burn. You might want to use this method for frying bacon, eggs, pancakes, or sausages. Most Dutch oven lids are slightly shallow with a dip in the middle so they can hold runny ingredients. Dig a hole about 3 feet deep and line it with rocks. You should be able to build a fire in the in it. The heat from the wood fire should heat the stones so that you can lower your Dutch oven into the hole and cook the food. Cover the lid of the Dutch oven with coals and shovel dirt over the hole. This will trap the heat. You'll need to leave the Dutch oven to cook, usually overnight. Keep in mind that it will take several hours to get the rocks in the hole hot enough before your can lower the bean pot down. It's a good idea to par boil your dry beans for an hour and then soak them in water overnight before you even begin using the bean hole to cook them. If you need to cook a large meal for a crowd or just want some variety in the meal you're cooking outside, stack several ovens. You'll need at least three Dutch ovens. Fill your Dutch ovens with food and place hot coals underneath the largest one. Place hot coals on its lid and then stack another Dutch oven directly on top. Place coals over this oven's lid and stack another Dutch oven. Finish by placing coals on the topmost Dutch oven's lid and let the food cook. You can use Dutch ovens of the same size or you can tier them. For example, use a 14 inch Dutch oven on the bottom, a 12 inch in the middle, and a 10 inch on top. Since Dutch ovens maintain heat well, they're good for roasting large cuts of meat. Heat your conventional oven to 350 F (176 C). Heat your Dutch oven on the stove top and brown your meat to get a richer flavor. Add liquid and any vegetables you like to your Dutch oven. Cover it and place it in your preheated conventional oven. Bake your roast for an hour or two (longer if there's a bone in it). Only use a lid if it's made to withstand oven temperatures. Most Dutch oven lids should work, but avoid putting a lid in the oven if yours has any plastic parts. Just cover it with a sheet of aluminum foil instead. You can also use Dutch ovens in your oven when baking things like cornbread, cakes, or casseroles. If you want to make something that takes a long time to simmer, consider using your Dutch oven. Just set your Dutch oven on your burners and cook your food directly in it. Turn the heat to a little lower than you're used to when using other pots and let your food simmer for several hours. For example, you might make a stew with dumplings or chili. When using a cast iron Dutch oven, you don't need to cook with such high temperatures because the cast iron maintains heat so well. Try cooking on medium heat.
A: Bake with your Dutch oven. Boil water or food in your Dutch oven. Use the lid as a griddle or skillet. Try bean hole cooking. Consider stacking your Dutch ovens. Use your Dutch oven for roasting. Simmer food on the stove.

Q: One type of 3D glasses commonly used in theaters uses polarized filters for lenses, and special projectors that polarize light. Think of the polarizing filter as a barred window: light oriented (polarized) vertically passes between the bars and reaches your eye, while light oriented horizontally can't get through the bars and gets reflected away. With the "bars" over each eye pointing in different directions, each eye picks up a different image, and your brain interprets the two images as a single 3D image. Unlike the red-blue glasses, this image can contain any number of colors. Making these glasses at home is probably more expensive than buying a pair, especially since any theater experience or TV that relies this technology probably comes with a pair of glasses. But if you're interested in the project, purchase a sheet of "linearly polarized" or "plane polarized" plastic film. Rotate the film 45 from the vertical, then cut out a lens. Rotate the film another 90 in either direction, and cut out the second lens. This is the most common design, but you may need to rotate the lens while looking at the 3D image to see what works. Just make sure to rotate both lenses at the same time, since they should always be made from film oriented exactly 90 apart. The actual explanation of polarized light is more technical than described above. Modern 3D glasses usually use circular polarized light, which doesn't require the viewer to keep his head still while watching. To make these lenses at home, you would need one sheet of counterclockwise circular polarized plastic, and one sheet of clockwise polarized plastic (also called left- and right-handed). This is more expensive than linear filters. Sometimes called "Active 3D," this technology requires advanced design that can't be copied at home. In order to send a different image to each eye (which is the cornerstone of all 3D technology), the television monitor switches rapidly between two different images, many times per second. The special glasses you wear while watching are synchronized to the television, and each lens alternates between dark and clear at the exact same time, using tiny liquid crystal cells and an electrical signal. This is considered one of the most effective 3D glasses for comfortable, long-term use, but it's just not feasible to make these in your basement, let alone the television set programmed to synch with them.
A:
Learn about polarized glasses. Make your own polarized glasses. Understand synchronized glasses.