Neutral gray, complementary gray, and primary gray are easy to create with paint, but the best option depends on the paint colors you have and the desired application.  Neutral gray can be a great way to tone done other colors without altering the actual hue. Overall, it works best when you know you'll need gray in its purest form. Complementary gray works best if you want to give cool or warm tints to the hue of the gray. Primary gray works well when you need to create shadows or pair the gray next to a brighter color. Since primary gray contains all three primary colors, it can make nearby secondary colors look brighter.
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One-sentence summary -- Choose which type of gray to create.

Q: There are many dietary supplements that can increase your levels of HDL cholesterol and lower your LDL cholesterol, but many can have negative reactions if they’re taken together or if you take certain medications. Always talk to your doctor about supplements that they recommend or any supplements that you plan to take so you can be sure they’re safe for you.  For example, niacin can potentially react with other cholesterol or high blood pressure medications, so it’s important that you talk to your doctor before you take any supplements. Your doctor will also be able to recommend the right dosage for you. Fiber is an important part of a healthy diet and helps to balance cholesterol levels. Psyllium is a viscous dietary fiber that will help reduce LDL cholesterol, giving your HDL levels a boost. Take psyllium supplements to get more fiber in your diet.  Take 5-10 grams of psyllium daily, depending on the recommendations of your doctor and the amount of dietary fiber that you eat. You can find psyllium supplements at health food stores or by ordering them online. If you experience constipation or intestinal discomfort, stop taking psyllium and talk to your doctor. Allicin, or concentrated garlic, helps to reduce levels of “bad” LDL cholesterol and increase “good” HDL cholesterol. Take garlic supplements according to the directions on the packaging to help balance your cholesterol levels.  Take 10 mg garlic supplements daily to improve your cholesterol. Look for garlic supplements at health food stores and online. Niacin supplements could help increase HDL cholesterol levels and reduce the risk of cardiovascular disease. Talk to your doctor about taking a niacin supplement to see if it’s safe for you to use.  Niacin supplements used to treat cholesterol provide between 500 and 1,000 mg of niacin and require a prescription from your doctor. Potential side effects of taking niacin include itchiness, nausea, cramps, and insomnia.
A: Talk to your doctor about supplements that can boost your HDL levels. Increase your dietary fiber intake by taking psyllium. Lower your LDL cholesterol by taking garlic supplements. Use prescription niacin supplements to lower your LDL cholesterol.

Article: The mechanical bridge is perfect for shots where the ball is too far out of reach; they can be much more useful than trying to overreach and missing that shot because you're off-kilter. Don't be discouraged by the affectionate alternative names, "crutch" or "granny stick"—there's absolutely nothing shameful about using a mechanical bridge! Here's how you use it:  Place the bridge flat on the table, behind the cue ball. Place the cue in the groove that will give you the best shot. Hold the butt cap of the stick with your thumb, index, and middle finger. Place your head down into the line of the shot and take your shot.
Question: What is a summary of what this article is about?
Use a mechanical bridge.

Problem: Article: There are several companies that supply laboratories with materials and equipment for conducting cultures. When you purchase the materials, they will also come with protocols for starting the culture. These protocols will describe exactly how you should transfer the sample that you want to culture into the culture environment. Several well-known companies include:  Qiagen Fisher Scientific Thermo Scientific It is generally necessary to replenish the culture media every 2 – 3 days. Follow the manufacturer’s protocols for feeding the cells.  This process should take 20 minutes or less. If you do not provide sufficient nutrients, the cells that you do have will die. In order to keep the culture growing, you may need to move some of the cells into a new dish with a lower density. This will enable both the original culture and the new one to continue growing. You can also freeze some of the cultures for future work or to repeat experiments if you have problems with contamination in the future. Follow the provided protocols to determine the temperature for cryopreservation or freezing the cultures.
Summary: Follow the manufacturer’s protocols for starting the culture. Feed the cells if you are working with mammalian cells. Split cultures that are starting to get crowded.

Article: If you are making your boxes 16 inches (41 cm) wide, measure 16 inches (41 cm) from one side, mark it, and repeat this for each divider. This will ensure that you’re placing the dividers evenly so that all the boxes end up the same size. You should measure and mark along both lengthwise edges of the bottom piece to be sure your measurements are straight. Follow the markings you made on the bottom piece and glue your dividers in place, using a heavy object to prop them up on each side while they dry. Glue your side pieces in place on each short edge of the bottom piece and prop them up as well. When you’re propping up the piece to dry, use a level to make sure they’re positioned straight up and down. Otherwise, you’ll have trouble attaching the top piece. Once the glue on the sides and dividers is dry, take the support pieces you cut and screw or nail them down on either side of each divider. Do the same next to each side piece. It should fit on the boxes so that it’s flush with the top edges of each side and divider. Attach it with 2-3 screws or nails in each place where it meets a side or divider.  Make sure your nails or screws are long enough to go through the top piece and at least 1 inch (2.5 cm) into the sides or dividers underneath it. For extra stability, flip the boxes over and put 2-3 screws or nails in the bottom piece in each place where it meets a side or divider. The back side of the boxes, where you will attach the back piece, should be facing up so that you can rest the back piece on top while you attach it. Use at least 6-8 nails or screws for each box to ensure that it’s well secured. Since the bottom piece will stick out farther in the front, you may need to set the boxes on top of cinder-blocks so that it can lie flat. You can also have 2 people hold the back piece in place while you attach it instead of turning it over. These are the two long, thin boards that you will attach to the top front and bottom front of the boxes to secure them and keep bedding from falling out. Flip the boxes over so that the front faces up and the back piece is resting on the ground. Place the front lip along the bottom edge and attach it, using one screw or nail for every side and divider. Do the same with the trim along the top edge. Set it so that it runs along the front edge of the bottom piece where it sticks out further than the boxes. Attach it using 1 screw or nail for every box.
Question: What is a summary of what this article is about?
Measure and mark where your dividers will go on the bottom piece. Glue your sides and dividers to the bottom piece using wood glue. Attach supports to the bottom piece next to each side and divider. Add the top piece to your boxes. Turn the boxes over and attach the back piece. Attach the front lip and trim. Add the perch board to the bottom piece.