Article: A microfiber cloth or a jewelry-polishing cloth are ideal for polishing your necklace. These cloths won't scratch your jewelry like paper towels or even tissues can. You want something soft and lint-free for polishing. If you need to get into small areas, try a cotton swab. If your silver necklace is only mildly tarnished, you can start by using a bit of dish soap. In a cup of warm water, add a few drops of the soap. Stir it up, then wet your cloth with the solution to start polishing your necklace. You may think the ideal polishing motion is circular. However, that can actually scratch up your silver. A better idea is to rub back and forth, making sure to go along the grain of the metal, which is less likely to scratch it. With the chain, you may need to gently rub it between two fingers, using the cloth. Continue to move to clean sections of the cloth, so you're not adding tarnish back on to the necklace. You can also use a clean soft-bristled toothbrush for detailed areas, though try not to brush too hard. In some cases, the person who made the necklace may have let certain parts of the jewelry darken to highlight details. If you have a piece like that, you need to avoid polishing those areas so you don't lose some of the beauty of your piece.
Question: What is a summary of what this article is about?
Use a cloth that doesn't scratch. Start with a bit of soap. Rub along the grain. Avoid intentionally oxidized details.
Article: Blue light tricks your brain into thinking it's the afternoon, and screens are full of blue light. Avoid computers, television, and cell phones for at least an hour before you plan to fall asleep. This will lead to deeper, more restful sleep. As an alternative, try an turning on Night Shift (iOS), Night Light (Windows 10), or use an app like F.lux as they reduce the blue light emitted from your device's screen. Many people take alcohol to help them fall asleep, without realizing that it leads to restless sleep. Similarly, the relaxing effect of cigarettes doesn't outweigh the buzz of nicotine. Avoid both of these substances in the late evening, or you may find yourself awake before your alarm. Finally, as you probably know, caffeine from coffee, soda, or chocolate can make it much more difficult to sleep. Some people are extra-sensitive to caffeine, and may have trouble sleeping if they drink coffee or tea in the afternoon. Try skipping everything but your morning dose for a few days. Your sleep may improve. Eating large portions of rich foods can lead to restless sleep. Eat dinner at least two hours before you go to bed. If you get hungry in the late evening, eat a light snack and drink a glass of water or milk. If you have to get up in the morning to pee, you'll have a harder time sleeping in. Drink no more than a small glass of water to stay hydrated.
Question: What is a summary of what this article is about?
Stay away from digital screens before bedtime. Minimize alcohol, cigarettes, and caffeine. Avoid heavy meals before bed. Reduce the amount of water you drink.
Article: Newton's second law of motion states that force equals mass times acceleration: F = ma. If you know the net force on the object, and it's acceleration, you can rearrange this formula to find the mass: m = F / a. Force is measured in N (newton), which you can also write as (kg * m)/ s2. Acceleration is measured in m/s2. When you calculate F / a, the units cancel to give you an answer in kilograms (kg). Mass is the amount of matter in an object; this does not change unless you cut off part of the object, or attach more material. Weight is a measurement of gravity's effect on mass. If you move the object to an area with different gravity (such as from the earth to the moon), it's weight will change, but it's mass will not. An object with more mass does weigh more than an object with less mass, if they're experiencing the same gravity. . If you're doing your chemistry homework, you may come across the term "molar mass." This is a related concept, but instead of measuring an object, you measure exactly one mole of a substance. Here's how to calculate it in most contexts: For an element: look up the atomic mass of the element or compound you are measuring. This will be in "atomic mass units" (amu). Multiply by the molar mass constant, 1 g/mol, to put it into standard molar mass units: g/mol. For a compound: add the atomic masses of each atom in the compound to find the total amu of the molecule. Multiply this total by 1 g/mol.
Question: What is a summary of what this article is about?
Determine mass with force and acceleration. Understand mass and weight. Calculate molar mass