While it’s hard to beat the convenience of ordering an office chair from a website or catalog, “try before you buy” is definitely the better way to go when it comes to ergonomic seating.  Gather all the evidence and advice you can, but in the end make the choice based on your needs and your comfort. For instance, the ergonomic seating diagram available at https://www.ccohs.ca/oshanswers/ergonomics/office/chair.html is a good starting point, but don’t assume that your ideal chair will exactly match its measurements and details. Due to the prevalence of sitting-related injuries, as well as their negative impacts on worker productivity and healthcare costs, there is ample research available regarding ergonomic seating.  These studies have established certain chair measurements that tend to make them more ergonomic.  Remember, however, that your body needs to be the final judge.  The seat of the chair should be about 17 inches high if fixed in place, or 15”–24” if adjustable.  The “seat pan” should be 16.5” (fixed) or 14”–18.5” (adjustable) in depth, and 20”–22” in width (or wide enough to allow at least one inch per side beyond your seated hips).  The backrest should be 12”–19” wide, and high enough to support your entire back, at least to the shoulders if not beyond.  If the chair has armrests, they should be adjustable and 7”–11” above the compressed seat height (that is, the top of the seat pan when you’re sitting on it).  While not as precise of a measurement, when seated, you should be able to fit your fist between the back of your knee and the front of the seat pan (with your back against the backrest).  To convert inches to centimeters, multiply by 0.39. While you might assume that sitting perfectly upright would be the ideal position, it turns out that a slight recline can substantially reduce the amount of pressure placed upon the discs in your back.  A seat back that leans back about 15–20 degrees (105–110 degrees from parallel with the ground), and perhaps even up to 30 degrees, is likely to be more comfortable.  Although a slight recline places less pressure on the discs, it’s important not to lean back too much. Leaning back too much may be better for the disc, but it also leads to a change in the position of the neck, putting the neck in slight extension. This can often lead to shortened muscles and eventually muscle pain and tension headaches. While on the topic of angles, your knees should be bent at right angles (90 degrees) when seated.  The angle at your hip should be just slightly beyond a right angle, to accommodate the slight recline in you back positioning. Use all the measurements and angles as a guide, but prioritize some simple observations when determining your ideal seat.  For instance, when seated, your feet should be able to be (and actually be) planted firmly and flat on the floor.  Your knees should be level with the seat pan, and your lower back against the seat back (or lumbar support). If you can’t find a comfortable and supportive chair that lets your feet rest flat on the floor, utilize a flat footrest attachment. Adjustable chairs are usually the better choice, as they permit personalization to meet your unique body type and comfort needs.  That said, some ergonomic chairs have so many complicated adjustment controls (manual or electronic) that they are often not used properly. Take a little time to figure out how the levers, pedals, buttons, etc. on the chair work before you begin using it regularly.  Know how to adjust it to your comfort specifications, instead of having to fiddle around with it while you’re juggling a half-dozen other tasks. Experts say you should give an ergonomic chair a “test sit” of one to two hours before deciding if it is right for you.  Ideally, that should also be the maximum amount of time that you ever sit in the chair thereafter without getting up to take an on-your-feet break.  No matter how well-designed a chair may be, sitting increases pressure on the discs in your back and can hinder blood flow to your legs.  Simply standing up reduces these problems and burns substantially more calories; actually moving around a bit is even better. Give yourself an excuse and/or a reminder to get up every hour or so and move around a bit.  Your comfy chair will be there waiting for you when you get back. Consider setting a timer on your computer to remind you to get up from your desk for a few minutes every hour.
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One-sentence summary -- Find the right fit for you. Take chair measurements. Establish your seating angles. Don’t forget your feet. Prefer an adjustable chair with simple controls. Take breaks from sitting.

Q: Take out ice cubes or pieces of ice from the freezer and put them directly into your blender or food processor. Put in as much as you plan on using, or make a big batch to store in the freezer. It will work best if all the pieces of ice are approximately the same size. Put the lid securely on the blender or food processor. Use the pulse button to blend the ice in short bursts until there are no large pieces. If your blender or food processor doesn't have a pulse button, then just use the highest speed setting for short bursts. The heat of the motor in the blender or food processor will melt some of the ice. Pour it through a strainer so that you are left with just the ice and you won't get watered-down drinks. If you don't have a strainer, you can hold something over the top of the blender or food processor to block the ice, then slowly pour the water out. Store any left over ice in a plastic, sealable freezer bag, and put it in the freezer for when you need it next. Try to make your drinks as fast as possible, since crushed ice melts faster than bigger pieces. If you do freeze crushed ice, some of it will probably freeze back together. However, it will be easy to break it apart again by hitting it inside of the bag you stored it in.
A: Put a few handfuls of ice from the freezer into a blender or food processor. Pulse the ice until you have crushed ice of the desired size. Pour the crushed ice into a strainer to drain the excess water. Use the crushed ice right away or store it in a bag in the freezer.

Article: If you're mailing a letter of standard size weighing less than an ounce and addressed to a U.S. address (including an APO or FPO address), place one first-class stamp in the top-right corner of the letter. Stamps are available for purchase at any post office, online at USPS.com, and at various retail stores.  Stamps come with either standard or special designs. If you want to purchase a decorative or commemorative stamp, go to a post office and ask to see their selection. Stamps rise in price periodically. If you have old postage stamps, check usps.com to make sure the stamps you have will still cover the full cost of first-class postage. You may have to use more than one stamp. Letters that are heavy or oversized and letters that are being mailed overseas require extra postage to reach their destination. USPS.com displays all current postage rates.  If you have an accurate postage scale at home, you can weigh and measure your letter to determine how much postage you'll need to pay. Record the measurements, then check USPS.com for rates. Affix the appropriate postage to the top-right corner of your letter. If you don't have a scale, take your letter to a post office to have it weighed. The clerk will be able to calculate exactly how much postage you'll need.
Question: What is a summary of what this article is about?
Use a first-class stamp. Buy extra postage.

Article: " The lower the resolution, the larger items and text will appear; the higher the resolution, the smaller items and text will appear on-screen.
Question: What is a summary of what this article is about?
Using your mouse, right-click on the Desktop and select "Screen Resolution. Click on the dropdown menu to the right of “Resolution,” and move the slider button up or down to choose your desired resolution. Click on “Apply,” then click on “Keep” to verify you want the current resolution saved.