In one sentence, describe what the following article is about: For perfectly straight lines, use a chalk line. Gran one end yourself and have a friend hold the other. Hold the line about 2 feet (0.61m) over the region to be cut. In one quick motion, raise the chalk line up about 1 foot (0.30m) and snap it down so that it hits the ground and applies chalk in a straight line. If you freehand your line with chalk, make sure to make it as thick as possible. For a 1-week chalk lifespan, use blue and white colors. Orange, green, and yellow last 2 to 3 weeks, while red and black last around 2 months. Fix a pair of vice grips to the side of the old blade to prevent it from spinning. Unscrew the center bolt in the middle of the blade with a wrench. Now, remove the small rim piece (called a flange) underneath and take the old blade out. Attach your diamond blade, taking care that the teeth point in the opposite direction as the cut. Finally, reattach the flange and bolt. Fix a pair of vice grips to the diamond blade if it's moving around while you're reattaching the bolt. If you're using a cut-off saw, you're probably cutting concrete between 4 to 6 inches (10 to 15cm) in depth. Loosen the blade lever to release it and adjust the base plate around the saw until the correct amount of saw is exposed. After the blade is at the right depth, place your index finger under the base plate to hold it in place and tighten the blade lever. To help you accurately adjust the depth, place the saw onto a long piece of wood as thick as the desired depth. Let the blade hang down over one side and use it as a guide. Angle the saw at a 45 degrees to the concrete and stand slightly to the left of the saw so that you're also facing the cutline at a 45-degree angle. Hold the backmost handle with your dominant hand and use it to move the saw forward and backward. Grip the frontmost handle with your non-dominant hand and use it to guide the blade along the chalk line. Proceed slowly, maintaining minimum RPMs of the cut-off saw. Face your dominant foot outward from the saw, perpendicular to the cutline. Keep your nondominant foot facing the cutline at a 45-degree angle. Cut for 30 to 45 seconds at a time and let the blade cool for an equal amount of time. Never apply water to electric cut-off saw blades.
Summary: Mark the cutlines on your concrete using chalk lines or a piece of chalk. Attach a 14 inch (36cm) wet-cutting diamond blade to a cut-off saw. Adjust the blade depth of your cut-off saw. Cut along the chalklines at the lowest revolutions per minute (RPM) setting.

Unfortunately, there are a lot of myths surrounding food and increased levels of serotonin. These myths include: Foods rich in tryptophan automatically boost serotonin. This is false. Most foods that contain tryptophan, an amino acid, compete with other amino acids to be absorbed by the body's transport system. Eating a lot of turkey, which is rich in tryptophan, will not automatically give you more serotonin. Eating a lot of banana will automatically boost serotonin. Bananas do contain serotonin. That serotonin, however, is unable to cross the blood-brain barrier and be absorbed by humans. Complex carbohydrates are absorbed by the body differently than simple carbohydrates. Simple carbs raise your blood levels quickly, causing a spike in insulin, which drops after a while. Complex carbs are absorbed more slowly by the body and therefore avoid the massive peaks and troughs brought upon by simple carbs. Complex carbs include: Legumes like peas and lentils Whole grain breads Whole grain pastas Brown rice Starchy vegetables like sweet potatoes and parsnips Simple carbs include: Yogurt Fruit juice "Normal" pasta Cakes, candies, and other refined sugar products White bread and white rice, while not technically simple carbs, are absorbed by your body in a similar way. Caffeine suppresses serotonin, which could also help explain why it's a hunger suppressant as well. Energy drinks contain large amounts of sugar, which the body processes quickly, but which produce an energy-zapping low after the insulin has finished surging. If you have to drink caffeinated products, wait until after you've eaten, doctors recommend. Omega-3 fatty acids are hypothesized to affect the functionality of serotonin in the brain. People with low serotonin levels commonly have low DHA levels, which is an essential building block in the brain, and which needs to be replenished with foods such as fish oils, which are high in omega-3 fatty acids. Look for omega-3 fats in: Fish, such as salmon, and fish oils Nuts, seeds and seed oils, such as flax seed oil Eating dark chocolate improves serotonin levels partly because of resveratrol.Resveratrol boosts both endorphins and serotonin levels. Remember to reach for dark chocolate instead of milk chocolate, as milk chocolate contains far less cocoa (the stuff that produces serotonin) than dark chocolate.
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One-sentence summary -- Understand the serotonin/food myths. Shun the simple carbs and embrace the complex carbs. Avoid caffeinated foods, especially energy drinks. Eat healthy fats, such as omega-3 fatty acids. Eat dark chocolate.

Problem: Article: Stop using any products that contain tretinoin, like Retin-A or Differin, at least a week before your chemical peel. These products can irritate your skin, which could impact the outcome of your peel. For glycolic acid and lactic acid peels, discontinue there products for 3-4 days before and after your peel. For TCA peels, stop using them for 5 days before and 10 days after your peel. Perform a mild exfoliation treatment 24 hours prior to your treatment, using a gentle facial scrub. After washing your skin, apply a pH solution to prepare your skin for the peel. Apply a dab of the chemical peel to your forearm or to the area of skin below your ear at the hairline. Leave the solution on for at least a minute before washing it off. Check the patch test after 24 hours to make sure your skin doesn't react negatively to the peel. If your skin looks normal around the test area, proceed with your chemical peel. If your skin is irritated, red, or tender, lower the concentration of the active ingredient (glycolic, lactic or trichloroacetic acid) in the peel solution and try another test. If you get to the lowest concentration of chemicals and still see a reaction, do not do the chemical peel. If you have any signs of an allergic reaction, like itching or hives, do not use the chemical peel. Apply the peel with a Q-tip using your fingers may make your fingers peel.
Summary:
Stop using tretinoin-based products for a week. Gently exfoliate your face the day before your peel. Do a spot test before applying your peel.