INPUT ARTICLE: Article: In order to change your Internet connection's properties, you'll have to be actively connected to the Internet. Click the Apple logo in the top-left corner of the screen. A drop-down menu will appear. It's near the top of the drop-down menu. This opens the System Preferences window. This globe-shaped icon is in the System Preferences window. On the left side of the window, click the Wi-Fi (or Ethernet, if you're using a cable) connection to which your Mac is currently connected. It's in the lower-right side of the window. Doing so opens a pop-up window. You'll find this option at the top of the pop-up window. It's in the lower-left side of the window. Doing so creates a text field in the "DNS Servers" column. Type in the address for a primary DNS server. Both Google and OpenDNS have free servers that you can use here:   Google  — Enter 8.8.8.8 here.  OpenDNS — Enter 208.67.222.222 here. Click ＋ again, then enter one of the following addresses:   Google  — Enter 8.8.4.4 here.  OpenDNS — Enter 208.67.220.220 here. It's at the bottom of the window. This will save your settings and close the "Advanced" pop-up window. You'll find this option at the bottom of the window. Your settings will be applied to your Internet connection from now on. . You can do this by typing sudo killall -HUP mDNSResponder;say DNS cache has been flushed into Terminal and pressing ↵ Enter. Flushing the DNS cache will help resolve any website loading errors you might run into when you next open your browser. Click the Apple menu {"smallUrl":"https:\/\/www.wikihow.com\/images\/f\/ff\/Macapple1.png","bigUrl":"\/images\/thumb\/f\/ff\/Macapple1.png\/29px-Macapple1.png","smallWidth":460,"smallHeight":476,"bigWidth":"29","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Mac icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"}, click Restart..., and click Restart when prompted. Once your Mac finishes restarting and connecting to the Internet, you should notice an increase in your Internet's speed.

SUMMARY: Make sure that you're connected to the Internet. Open the Apple menu . Click System Preferences…. Click Network. Select your Internet connection. Click Advanced…. Click the DNS tab. Click ＋. Enter the primary DNS address. Enter the alternate DNS address. Click OK. Click Apply. Flush your Mac's DNS cache Restart your Mac.

In one sentence, describe what the following article is about: If your wheel covers will not mount on the vehicle, it may be because the covers were made for a different sized wheel.  Automotive wheels come in a wide variety of sizes that are usually measured in inches.  Check the size of the wheel you have by locating the tire size printed on the tire.  The last number in the tire size (such as P215/65 R15) is the number of inches the wheel is in diameter. Be sure the wheel cover you purchased is intended for that size wheel. Some kinds of wheels cannot have wheel covers mounted on them because of their design.  Often, decorative wheel designs do not permit the mounting of a wheel cover.  If there isn’t a lip around the perimeter of the wheel, the wheel cover likely won’t mount.  Look for a lip around the outside of the wheel for the retention ring to seat in. If there is no lip, wheel covers likely cannot be installed. If your new wheel cover will not seat properly on the wheel, be sure the old wheel cover has already been removed.  Also check to see if the lug nuts are still in place, as many wheel covers are meant to be installed beneath lug nuts.  Thin wheel covers that come from the factory may be difficult to distinguish from steel rims in some instances. Your new wheel covers may require the removal of lug nuts before they can be mounted. If the new wheel covers do not mount to your wheels, check to make sure the retention rings are installed properly on the underside of the covers.  If the retention rings are not installed, you will need to install them prior to mounting the wheel covers. Most new wheel covers come with retention rings.  If you do not have them, return to where you purchased the covers to get rings to mount them.
Summary: Verify the size of your wheels. Assess whether or not a wheel cover can be installed. Ensure old wheel covers have been removed. Make sure the retention ring is installed on new wheel covers.

INPUT ARTICLE: Article: Besides cost and ease of screening, these tests also vary in accuracy. Some physicians will start with the peripheral test and only conduct the centralized test if the first screen indicates poor bone density.  Peripheral machines are small and portable, and they check bone density on the periphery of your skeleton, such as finger bones or the heel. They are much cheaper but not always a good indicator of bone health in bones that are the most likely to break. Centralized bone scans involve a large X-ray machine with a movable arm that will scan different parts of your skeleton while you lie on a padded table. This machine tests bone density at your hip, lower back, and forearms to get a good measure of the strength of bones that are most likely to break in a slip or fall. Most individuals receive bone density scans to check for signs of osteoporosis.  Bone density scans are often used to detect your individual risk of bone fracture and your personal chance of developing osteoporosis if you do not currently have the condition. Bone density scans can also be used to monitor the effectiveness of osteoporosis treatments.

SUMMARY:
Understand the differences between peripheral and centralized bone scans. Know the purpose of a bone density test.