Bears are attracted to food smells, so they will want to dig through your garbage. A bear-proof trash can uses a locking lid to keep bears out of it. They're also sturdier than other trash cans.  Another option is a locked shed to hold your garbage cans. Take your garbage out as close to pickup time as you can. Double bag your garbage to contain smells. Wash your trash cans often to decrease lingering scents. You can also pour ammonia on your garbage, which will decrease the likelihood a bear will go digging through it.  Never mix bleach and ammonia, as it creates toxic fumes. Bears are omnivores, meaning they eat meat and plants. They have no problem going after the seeds you leave out for your local bird population. When bears are out of hibernation in the summer, they're likely to visit your yard for a tasty snack.  If you do have bird feeders, hang them up high. Aim for at least 10 feet (3.0 m)off the ground with no nearby trees. Also, make sure you clean up the seed under the feeder regularly. If you see a bear near your bird feeders, stop putting out birdseed for at least a month. Like birdseed, fruit can attract bears to your home, particularly if you don't harvest it in a timely manner. If you want fruit trees, don't plant them right next to your home, but instead, set them back as far as you can. Put them at the back end of your property or yard. In addition, pick fruit as soon as it ripens or even when it's slightly green. Sweep up any fruit that falls to the ground and spoils. Bears are attracted to any food source, including food for outdoor pets like dogs and livestock. If you must leave food outside to feed your animals, bring it in at night when bears are more likely to roam and forage. If you need to store food outside, use airtight, odorless containers. The food you place in a compost pile could attract a bear to the area, particularly strongly scented fruits like melons or pineapple. Wood piles can attract insects and small animals, which the bears will also eat. Avoid putting strongly scented fruits in your compost area, as they will attract bears if you do. Burn off any remaining food particles on the grill by letting the fire flame up. Scrape the grill down with a grill brush while it's still warm. Once it's just warm to the touch, scrub down the grill with a sturdy brush, dish soap, and warm water to remove any grease left behind. Focus on the grate and the area below the grate. The residue left behind can attract bears, particularly any meat drippings at the bottom. Keep your barbecue in a locked area if possible so bears can't get to it. If you have a meal outside, bring all the food back inside at the end of the night. Don't leave out scraps or leftovers for the birds to eat, as they can attract bears. Clean up around the eating area by wiping down your table and sweeping up any scraps left behind. Chickens and honey are tasty snacks for bears, so they will draw them to the area. Set the enclosures for these animals away from your home, protected by electric fencing. You can purchase electric fencing kits at home improvement stores. To set up an electric fence, place a post at each corner and one every 40 feet (12 m). Add insulators and string the wire along the posts. Connect the wire to the charger to run electricity through the wire. Electric fencing and motion-activated lights can be enough to scare bears away from your yard. For your home, you may want to install bars or grates over the windows, as bears can smash through glass. Motion-activated water spraying systems, made for all kinds of animals, may also deter bears. These areas are the perfect place for bears to hide out, so block them off, particularly in winter. Buy wood panels large enough to cover these areas, and nail them in place. Also, block off any crawlspaces below your home by nailing wood panels across them. Similarly, bolt and reinforce doors on cabins and add heavy shutters to the windows. Bears occasionally break into summer homes to den, especially when they are sure humans have vacated the area.
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One-sentence summary -- Hide your garbage with bear-proof trash cans. Remove bird feeders from your yard during summer months. Keep fruit trees away from your home. Avoid leaving pet food outside, particularly at night. Keep compost heaps and wood piles at the back end of your property. Clean your barbecue after each use. Avoid leaving food outside near your home. Enclose beehives and chicken pens with electric fencing. Add deterrents to your home and yard to keep bears out. Close off the areas below decks and porches in the winter.

Article: Let's say you're measuring a stick that falls near 4.2 cm, give or take one millimeter. This means that you know the stick falls almost on 4.2 cm, but that it could actually be just a bit smaller or larger than that measurement, with the error of one millimeter. State the uncertainty like this: 4.2 cm ± 0.1 cm. You can also rewrite this as 4.2 cm ± 1 mm, since 0.1 cm = 1 mm. Measurements that involve a calculation of uncertainty are typically rounded to one or two significant digits. The most important point is that you should round your experimental measurement to the same decimal place as the uncertainty to keep your measurements consistent.  If your experimental measurement is 60 cm, then your uncertainty calculation should be rounded to a whole number as well. For example, the uncertainty for this measurement can be 60 cm ± 2 cm, but not 60 cm ± 2.2 cm. If your experimental measurement is 3.4 cm, then your uncertainty calculation should be rounded to .1 cm. For example, the uncertainty for this measurement can be 3.4 cm ± .1 cm, but not 3.4 cm ± 1 cm. Let's say you're measuring the diameter of a round ball with a ruler. This is tricky because it'll be difficult to say exactly where the outer edges of the ball line up with the ruler since they are curved, not straight. Let's say the ruler can find the measurement to the nearest .1 cm -- this does not mean that you can measure the diameter to this level of precision.  Study the edges of the ball and the ruler to get a sense of how reliably you can measure its diameter. In a standard ruler, the markings at .5 cm show up clearly -- but let's say you can get a little bit closer than that. If it looks like you can get about within .3 cm of an accurate measurement, then your uncertainty is .3 cm. Now, measure the diameter of the ball. Let's say you get about 7.6 cm. Just state the estimated measurement along with the uncertainty. The diameter of the ball is 7.6 cm ± .3 cm. Let's say you're measuring a stack of 10 CD cases that are all the same length. Let's say you want to find the measurement of the thickness of just one CD case. This measurement will be so small that your percentage of uncertainty will be a bit high. But when you measure 10 CD cases stacked together, you can just divide the result and its uncertainty by the number of CD cases to find the thickness of one CD case.  Let's say that you can't get much closer than to .2 cm of measurements by using a ruler. So, your uncertainty is ± .2 cm. Let's say you measured that all of the CD cases stacked together are of a thickness of 22 cm. Now, just divide the measurement and uncertainty by 10, the number of CD cases. 22 cm/10 = 2.2 cm and .2 cm/10 = .02 cm. This means that the thickness of one CD case is 2.20 cm ± .02 cm. To increase the certainty of your measurements, whether you're measuring the length of on object or the amount of time it takes for an object to cross a certain distance, you'll be increasing your chances of getting an accurate measurement if you take several measurements. Finding the average of your multiple measurements will help you get a more accurate picture of the measurement while calculating the uncertainty.
Question: What is a summary of what this article is about?
State uncertainty in its proper form. Always round the experimental measurement to the same decimal place as the uncertainty. Calculate uncertainty from a single measurement. Calculate uncertainty of a single measurement of multiple objects. Take your measurements multiple times.