It's at the top of the screen. If you don't know the name of an app you'd like to download, try searching for a keyword like "video" or "paint". As you type, suggestions will pop up below the search bar; tapping one of these suggestions will search for it. It's the blue button in the bottom-right corner of your iPhone's keyboard. You may have to scroll through the apps listed on this page or re-enter a new search query to do so. You can also go back to one of the tabs visited previously and tap on an app you like. This option is to the right of the app. If you chose a paid app, you'll tap the price instead (e.g., $1.99). If you've downloaded the app before, there will be a cloud icon with a downward-facing arrow here instead. It's in the same place as the Get or price button was. Doing so will prompt you to enter your Apple ID password. If you aren't logged into your Apple ID account on your iPhone, you'll need to enter your Apple ID email address as well. Alternatively, you can scan your fingerprint if you have Touch ID enabled. You'll see a small square with a circle appear to the right of the app; once the circle is entirely filled in, your app will be done downloading. This can take anywhere from a few seconds to a few minutes depending on the size of the app and the strength of your Internet connection.  Tapping the square in the middle of the circle will stop the download. As a rule of thumb, avoid downloading apps when you aren't connected to Wi-Fi. Downloading apps over cellular data may incur charges from your carrier. Once your app finishes downloading, you can tap Open where the Get option was to open it.
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One-sentence summary -- Tap the search bar. Type in an app's name. Tap Search. Find an app you like. Tap Get. Tap Install. Enter your Apple ID password. Wait for your app to finish downloading.


Red eye happens when a camera’s flash reflects back off the retina at the back of an eye. As such, you can avoid red eye altogether by taking pictures in well-lit areas where flash is unnecessary. In the Camera app, tap the ⚡icon in the upper-left corner of the screen to change the flash options.  Tap Auto if you'd like the Camera app to activate the flash only when lighting conditions require it. Tap Off if you don't want the flash to activate when you take photos or videos. Ask your subject to look slightly to one side of the camera, rather than directly toward it. When people have been drinking, their pupils don’t react as quickly to light. This means there's more time for the flash to bounce off their retinas, which increases the likelihood of red eye.
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One-sentence summary -- Turn off flash. Redirect the subject’s gaze. Avoid flash photos of subjects who have been drinking.


A large can or metal bowl will work, but it should be of a disposable nature.  Resin can be mixed in a clean plastic container, but because it generates heat when it sets, extreme care should be taken if you use one. In a kit, you will have a pre-measured "can" or bucket of resin, and a pre-measured "tube" (like a glue tube) of hardener, so you can safely use an equal proportion of each material, i.e., half your hardener and half your resin, or some other proportion.  The mat (or cloth) will seem to melt into the resin as you spread it, and you can use the brush and additional coats of resin to build up the layer of fiberglass to a thickness of up to 1⁄4 inch (0.6 cm). As you spread the resin over the fiberglass mat, make sure to apply it over corners and weak spots with the same coverage that you would over flat, easy-to-reach surfaces. If you fail to get good coverage in corners, for example, your fiberglass will eventually develop weaknesses in those corners. Continue working until you have used all of your material.
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One-sentence summary -- Measure an appropriate amount of resin in a metal container. Add the hardener, according to package instructions. Stir this material thoroughly, being careful to stir the bottom and sides, and not just the middle of the container, using a paint stick. Lay mat on or in your form, and spread the resin mixture over it with a disposable paint brush. Work the mat and resin completely over your form until it is covered uniformly.


The following calculations will predict the stock necessary to achieve a certain cycle service level - i.e. the percentage of supply cycles that will result in a stockout. Average demand is the total quantity of a material or good required each day over a fixed period. A common approach is to check the total usage of that item for a specified period, such as one calendar month or the interval between ordering and delivery of stock, and then divide by the days in that month to find usage per day. For many items — such as long-established brands in a grocery store — historical demand will provide the best guide to calculating demand. Sometimes it makes more sense to consider future demand. For instance, if you manufacture car transmissions and have received a large order, you will want to factor that order into demand. In this case, you might consider calculating average demand and then adding in the demand created by the large order. Average demand can only tell you so much. If demand fluctuates dramatically from month to month or day to day, you will need to include that in your calculations so that you will have enough stock to cover surges in demand. Start by using a spreadsheet to calculate the standard deviation in demand (in Excel, enter all demand figures in their own cells, then the formula is = STDEV(the cells in question)). Or use the following formula:  Start with the average demand over a period of time (i.e. a week, month or year). For our example, let's say it is 20 units per month. Determine the absolute difference between each data point and the average. For example, if monthly demand was 8, 28, 13, 7, 15, 25, 17, 33, 40, 9, 11, and 34 units, the differences from 20 would be: 12, 8, 7, 13, 5, 5, 3, 13, 20, 11, 9, and 14. Square each difference. In our example, this would yield: 144, 64, 49, 169, 25, 25, 9, 169, 400, 121, 81, and 196. Calculate the average of the squares. E.g. 121 Take the square root of the average. This is your standard deviation of demand. E.g. 11 The service factor, or Z-score, is based on the standard deviation of demand. A Z-score of 1 will protect you from 1 standard deviation of demand. So in our example, since the standard deviation of demand was 11, it would take 11 units of safety stock in addition to normal stock to protect against one standard deviation, yielding a Z-score of 1. 22 units of safety stock would yield a Z-score of 2. The higher your Z-score, the less likely you are to have a stock-out. In choosing a Z-score, you will want to balance customer service and inventory cost. You will want a higher Z-score for stocked units with greater value to your business. A Z-score of 1.65, satisfying demand with a 95% confidence level, is generally regarded as acceptable even for important stock. In this case, that would mean stocking approximately 18 units (the standard deviation of 11 x 1.65) of safety stock, or 38 units total (average demand + safety stock). Here are how Z-scores relate to the probability you can fulfill demand:  Z-Score of 1 = 84% Z-Score of 1.28 = 90% Z-Score of 1.65 = 95% Z-Score of 2.33 = 99%
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One-sentence summary --
Look to historic demand and demand variability to determine how to avoid stockouts. Determine average demand. Consider future demand for particular stock items. Calculate demand variability. Determine your service factors, aka Z-scores. Decide on the Z-score you are looking for.