Article: You can buy a CO detector at any home improvement store or major retailer. They vary greatly in price but cost as little as $15. There are a number of features you should consider when making your purchase. A CO detector should be able to emit at least an 85-decibel sound that can be heard within 10 feet. If you or someone in your house has hearing problems, you may want one that has a louder horn. Some detectors come in sets and can be connected with each other. When one goes off, the others will as well. This is ideal for a larger domicile. Check the lifespan of the sensor as they can wear away. Your unit's sensor filament should last at least five years. Some detectors offer a digital display that will give you an exact readout of the CO measured in the air. This feature is not necessary but may help you detect harmful accumulations more quickly. For a small apartment, you can use only a single detector but if you have more than 3 rooms, you'll want multiple detectors. You'll want to place them strategically in areas where CO accumulates. CO is lighter than air so it will rise toward the ceiling. Place the detectors on the wall as close to the ceiling as possible. If your home has multiple stories, you should have at least one on each level. Place one detector near each sleeping area. Don't place them in the kitchen, garage, or near a fireplace. These rooms will experience short-term spikes in CO that aren't harmful and will set the alarms off unnecessarily. The display and sound settings vary greater from brand to brand and model to model so you will need read the manual thoroughly. Most digital displays will provide a number that tells you the amount of CO in Parts-per Million (PPM) and some include a timer to specify the length of the testing time. Many will include a volume adjuster, a backlighting option, and auto power-off feature. The unit should come with instructions to install. Make sure you have the necessary tools while you are out shopping for the detector so you don't need to make multiple trips. Make sure you have a sturdy ladder to place them up high on the wall. You'll probably also need a power drill. The screws will likely come with the unit. Some units are hardwired or plugged in but most run on batteries. The unit should emit a noise when the batteries are low. Make sure you also have at least one spare pack of the necessary battery type at all times.
Question: What is a summary of what this article is about?
Purchase detectors. Consider optional features. Find the right spots. Understand the display and sound settings. Install the detectors. Replace the batteries.

Problem: Article: If you think your horse has a hoof abscess, contact your vet right away. Your horse will likely be in a lot of pain, so taking your horse to your vet as soon as possible will allow for early diagnosis and prompt treatment. During the appointment, give your vet a detailed history of the hoof abscess. Describe when you first noticed your horse's lameness, and what you saw when you examined the affected hoof and lower leg. The more history you can provide to your vet, the easier it will be for them to make a diagnosis and treatment plan. When a horse is lame, an equine vet will perform a detailed lameness exam to determine the cause and severity of the lameness. One aspect of the lameness exam is an overall visual exam of the horse. Your vet will look at your horse to see how it walks and stands, and will take a close look at your horse's hooves and lower legs to identify abnormalities (e.g., swelling, wounds). Your vet may do this visual exam as you explain the history of the hoof problem. A lameness exam will help your vet rule out other causes of lameness, such as a fracture. This is important, since a hoof abscess can resemble other injuries or illnesses. A hoof tester is an instrument that tests the sensitivity of a hoof to focal pressure. During the lameness exam, your vet will use the hoof tester to apply pressure to different areas of the affected hoof. The part of the hoof that is most sensitive to pressure will indicate the general area of the abscess. Once your vet has identified a general area of the abscess, they will want to clean the hoof to identify the exact entry point of the bacteria. Your vet will use a paring knife to scrape away the old sole and clean the hoof. As part of the lameness exam, your vet may want to perform diagnostic nerve blocks. For a nerve block, your vet would inject a local anesthetic into the area around a nerve to block the sensation of everything below the block. This would help your vet localize your horse's pain and confirm that the pain is in fact within the hoof and not located higher up the leg. Your vet may also want to take x-rays. X-rays can help rule out a leg fracture. Also, if your vet found a sharp object stuck in the sole, they may want to take an x-ray with the object in place to see the path of entry for the bacteria. If your vet cannot find a wound or draining tract in the sole, they may want to take an x-ray to look for pockets of gas, which would indicate the presence of bacteria.
Summary: Schedule an appointment with your vet. Explain the hoof problem to your vet. Allow your vet to visually examine your horse. Have your vet use a hoof tester. Allow your vet to clean the affected hoof. Agree to your vet performing other diagnostic tests.

This is also called the "apex" of the rack. Make sure the 1-ball is at the apex, the 8-ball is in the middle of the rack, and both a stripe and solid are at the bottom corner, but line up all the other balls in random fashion. If solids and solids are together, or stripes and stripes, that's okay. One variant of this step in amateur play is to vary the edges of the rack so that the pattern is stripe, solid, stripe, solid, etc. This will result in the two corner balls being the same, i.e. either both stripe or both solid. Another variant of this step in amateur play is to order the balls down and from left to right, according to their number. This will always result in the 1-ball being at the apex, the 11 and 15 being at the bottom corners, and the 5-ball being in the 8's customary position. The center of the first ball should be in the middle of the table at one quarter of the length. Some tables have this spot marked with a small dot.
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One-sentence summary --
Start off with the 1-ball at the front of the rack. Place all the other balls at random. Line the apex (the first ball) up with the middle diamond on the side of the pool table.