In one sentence, describe what the following article is about: While the cake is cooling, mix together 4 tablespoons (57 g) of butter, 2 tablespoons (12 g) of cocoa powder, 1 ¼ cup (156 g) of powdered sugar, and ½ teaspoon (2.5 ml) of vanilla in a medium size bowl. Stir until all of the ingredients are well blended. You don’t necessarily have to make a chocolate frosting for the cookie cake. Use your favorite buttercream frosting recipe for a simple vanilla frosting if you prefer. You can also use canned frosting in your favorite flavor if you’re short on time. Once the butter mixture is well blended, begin stirring in 1 to 2 tablespoons (15 to 30 ml) of milk. You only want to add as much milk as is necessary to make the frosting smooth. Whole milk works best for the frosting, but you can use whatever type you prefer. After you’ve finished mixing the frosting, place it in a piping bag that’s fitted with a decorative tip. Carefully pipe the frosting along the outer edge of the cookie cake in whatever pattern you prefer.  Make sure that the cake has cooled before you pipe the frosting onto it. The frosting may melt otherwise. If you don’t have a piping bag, you can place the frosting in a sealed plastic bag and cut the tip off one of the bottom corners. Squeeze the bag so the frosting emerges from the hole just as it would through the tip of a piping bag. To make the cake more festive for the occasion, use the chocolate frosting in the piping bag or a tube of decorating gel to write “Happy Birthday” or a similar message on the cake. If you’re using a piping bag, you may need to switch to a smaller tip when you’re writing. If you want a more colorful look for the cake, press some bright sprinkles, colored sugar, or dragees into the frosting. Colorful candies, such as M&M’s, also make ideal decorations for the cake. Shaved chocolate and mini chocolate chips are also fun decorations for the cake.
Summary: Combine the butter, cocoa powder, powdered sugar, and vanilla. Add milk until the frosting is smooth. Place the frosting in a piping bag and pipe along the edges of the cake. Use the frosting or a decorating gel to write on the cake. Accent the cake with sprinkles.

In one sentence, describe what the following article is about: While the vehicle is still on the ground, look underneath the car, on the bottom of the steering knuckle attached to the wheel. The most common indicator is a grease fitting that doubles as a wear indicator. That fitting, or boss, will stick out of the bottom of the joint’s housing by about half an inch (1.25 centimeters). As it wears the boss will recede into the housing. As long as the boss protrudes out, the joint should be fine. Once the boss is flush with the housing or has receded even further, you’ll need to replace the ball joint. This applies to older cars. Most new cars do not have wear indicators, or a grease fitting. If you can’t find a wear indicator, or if the indicator doesn’t give you a clear enough sign, raise up the car to inspect the joint more thoroughly. To check a loaded lower ball joint, the manufacturer will recommend that you place a jack under the lower control arm of the front wheel, as close to the ball joint as you can, then raise the vehicle until the wheel leaves the ground. If you don't do this, tension will still be on the ball joint when you jack up the car, making it difficult to move and look for play on the joint. Make sure there is no compression in the suspension when you check the ball joint. If you have control arms of unequal lengths, make sure the upper bump stop doesn’t touch the control arm. Make sure your car is jacked securely. The vehicle must be on frame stands when jacked up and you are working on the vehicle. Move dial indicator to the side of the nut or to the side of the spindle and move the wheel in and out to check radial wear.  For vertical play, place the dial indicator against the steering knuckle stud nut or the ball joint housing, depending on the manufacturer. Grab the wheel at the top and bottom (12 and 6 o’clock) to lift up and pull down. Move the dial gauge to the side of the nut and grab the tire at the bottom and move it in and out to check radial play of the joint. Read the dial indicator and check against the manufacturer’s specifications. If the movement is beyond specifications, replace the ball joint. Experienced mechanics will also just check play by the feel, listening closely for any clicking or easy motion that suggests the ball joint is worn out. Alternatively, you could have a helper look closely at the joint itself to see if it appears loose as you move it.
Summary:
Look for a wear indicator. Raise the front end of the car. Rock the wheels and check for play.