In one sentence, describe what the following article is about: It’s important to have proper ventilation when sanding and painting so the dust and fumes don’t create respiratory issues. Open windows and doors or use a fan to circulate the air. You should also wear a respirator. A drop cloth or old blanket will protect the floor from paint spills. You can use painter’s tape to secure the drop cloth and to mask any areas you don’t want painted, such as an electrical outlet or faucet spout. Paint won’t stick to marble’s glossy finish, so it’s necessary to give it some texture. Rub 36-grit sandpaper back and forth over the surface you are going to paint to remove all of the finish. Keep sanding until there aren’t any glossy areas left. The marble should look dull and feel a little rough when you are finished. To remove the dust created by sanding, wipe down the area with a damp tack cloth. Rinse or replace the tack cloth as needed to remove all the dust and debris. Then, use a dry tack cloth to remove excess moisture. Wait until the surface is completely dry before moving on. Be sure to select an oil-based primer, or the paint won’t stick to the surface of the marble. Use a paint brush or roller to thinly coat the entire surface of the area you want to paint. Use long, even strokes in the same direction to prime the marble. If you don’t let the primer dry fully, you may smear it and have to start the project over. Plan to do this project over several days so that the end result is exactly what you want. Once the primer is dry, you can cover it in paint. Use a clean paint brush or roller to apply a thin, even layer of high-gloss oil-based paint in the color of your choice. Be sure to paint in the same direction, rather than doing some strokes up-and-down and others back-and-forth. After applying the first coat of paint, wait 16 hours or more before applying another coat. If you rush the job, the finish may bubble, smear, or become patchy. You will definitely want to apply a second coat, and perhaps even a third or fourth, depending on the color you are painting and how it looks after each coat. Use the same method as before to apply additional layers, and remember to let each coat fully dry before moving on. It’s important not to touch or set anything on the marble surface in the meantime. Otherwise, the items may stick to the surface and/or remove the paint.
Summary: Work in a well-ventilated area and wear a respirator. Lay out a drop cloth and mask areas you don’t want painted. Use 36-grit sandpaper to remove the finish from the marble. Clean the surface with a damp tack cloth, then let it dry. Prime the marble with an oil-based primer. Let the primer dry for 6-8 hours. Paint the surface using high-gloss oil-based paint. Allow each coat to dry for 16 hours. Apply additional coats as needed. Let the paint cure for 7 days.

Ear and facial piercings are very visible, which can cause problems at school or work for some people. If you're thinking about getting a piercing, make sure you won't have to take it out at school or at your job. If you're set on getting one, give some thought to covering your piercing in the meantime. Sometimes, schools will allow piercings to be covered with a small bandage while it heals. Temporary rings can be gently clipped onto the place you're considering piercing, allowing you to get used to the sight.  If you don't have a clip-on piercing, you can use a small sticker-backed bead, or small plastic jewel and stick it to your face with non-toxic white glue. It might seem silly, but you can look at yourself in the mirror from different angles. Go out in public if you want. Get other peoples' opinions. Keep looking at yourself in the mirror throughout the day in different lighting. At the end of the day, did you ever have any doubts about the placement? If so, you can always do this step again. Take a picture of yourself from the front and from different sides. See how it looks. Upload it online to see what your friends think. Make sure that it shows your whole face, head-on, in good lighting.  Upload the picture to an image editor. It can be as simple as Paint or you can use an advanced editor like Photoshop, or you can use an online editor like pixlr.com. Place a black dot (or a picture of a ring or stud) on your face to represent the piercing, if you don't have a clip-on. Step back from your computer and look at it. Adjust the placement until you have a good idea of where you want it. Experiment. As backwards as it may sound, you an use piercings to distract or augment certain things you might think of as flaws. For example, a bumpy or squat nose can easily be covered up with a nostril piercing. Don't like the shape of your brow? Try adding a ring, or drawing attention to other parts of your face, with a lip piercing. Don't make any snap decisions. Take a couple weeks to think about it. Keep trying on your fake piercings and making sure you like how it looks. Think about how much work it will take to keep clean. Make sure you really want it. The best person to talk to about any of your piercing questions and concerns is a piercer certified with the Association of Professional Piercers (APP), who are required to attend at least a year-long apprenticeship program, and stay up to date on blood borne pathogen safety. When you get pierced, make sure you get pierced by a professional. You may need to acquire your parents' consent before you get any part of your body pierced. In some areas, you can be 16 and get pierced without consent, while other areas require you to be 18 to get a piercing. In some areas, you must be at least 14 to get pierced, with or without your parents' consent.
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One-sentence summary -- Consider the visibility of the piercing. Use a temporary piercing. Take a picture. Think about your flaws. Sleep on it. Consult an experienced APP-certified piercer. Talk to your parents, if necessary.

Problem: Article: An eyepiece is not necessary to see objects, but it helps to keep your eye off of the viewing lens. It can also make viewing more comfortable. Use a drill or sharp object (e.g. scissors) to make a hole in the bottom of a film canister. The hole should be in the center of the canister and large enough to slide the smallest tube through. Line the smallest tube up with the hole in the canister. Push the tube so that the top (side with the lens) inch is inside the film canister. If the tube will not fit, make the hole larger until it does. Use glue or liquid cement to keep the eyepiece in place. This will allow you to look through the eyepiece without it moving. Give the glue time to dry.
Summary:
Make a hole in a film canister. Push the lens tube through the hole. Secure the eyepiece.