INPUT ARTICLE: Article: Your body uses the oxygen you inhale to react with the proteins, fatty acids, and carbohydrates you ingest. One of the results of this reaction is the carbon dioxide you exhale. In contrast, plants and some forms of bacteria take carbon dioxide from the air and, with energy supplied from sunlight, make simple sugars (which are carbohydrates). Life on Earth is based on the element carbon. To burn something requires a spark, a fuel source, and an atmosphere to burn it in. The oxygen in our atmosphere readily reacts with other substances; put it with burning carbon, and you get carbon dioxide. Calcium oxide (CaO), also known as quicklime, can be produced by burning limestone, which contains calcium carbonate (CaCO3). The CO2 is driven off, leaving the calcium oxide. (For this reason, it is also called burnt lime.) The carbon and oxygen that make up CO2 are found in a number of chemicals and minerals classified as carbonates or, when hydrogen is also present, bicarbonates. Reactions with other chemicals can release CO2 into the air or mix it with water to form carbonic acid (H2CO3). Some of the possible reactions include the following:  Hydrochloric acid and calcium carbonate. Hydrochloric acid (HCl) is the acid found in the human stomach. Calcium carbonate (CaCO3) is found in limestone, chalk, eggshells, pearls, and coral, as well as some antacids. When the two chemicals are mixed, calcium chloride and carbonic acid are formed, and the carbonic acid breaks down into water and carbon dioxide. Vinegar and baking soda. Vinegar is a solution of acetic acid (C2H4O2), while baking soda is sodium bicarbonate (NaHCO3). Mixing them produces water, sodium acetate, and CO2, usually in a foamy reaction. Methane and water vapor. This reaction is performed industrially to extract hydrogen by using steam at high temperatures. The methane (CH4) reacts with the water vapor (H2O) to produce hydrogen (H2) and carbon monoxide (CO), a deadly gas. The carbon monoxide is then mixed with water vapor at lower temperatures to produce more hydrogen and turn the carbon monoxide into safer carbon dioxide.  Yeast and sugar. When yeast is added to sugar in solution, as in the instructions in Part One, it forces the sugar to break down and give off CO2. The reaction also produces ethanol (C2H5OH), the form of alcohol found in alcoholic beverages. This reaction is called fermentation.

SUMMARY: Exhale. Burn something with carbon in it. Mix carbon-containing chemicals.

In one sentence, describe what the following article is about: You may not realize how much progress you’re making if you don’t track it. Try different ways of tracking yourself to see what works for you. Here are some ideas:  Put a star on your calendar for days you work on your goal. Post progress pics online. Tell your friend about your progress. Keep a goal diary to track what you’re doing. Keep a list of your milestone accomplishments. It usually takes a while to achieve a big goal. However, you’ll likely achieve a lot of small goals along the way. Make a point to celebrate each time you accomplish a small step on your journey toward your goal. This will remind you that you’re making progress and will help you stay on track. For instance, if you want to run a marathon, you might celebrate each time you finish a shorter race, such as 5k, 10k, and half-marathon runs. How you talk to yourself can have a lot of impact on what you’re able to accomplish. Tell yourself supportive statements, and challenge any negative thoughts you have. You might even try using positive affirmations.  Tell yourself things like, “I can do this,” “I’m making so much progress,” and “I can do anything I set my mind to.” If you catch yourself thinking something like, “This is too hard,” challenge it. Tell yourself, “I’ve done hard things in the past, and I can do this, too.” Identify the people in your life who make you feel upbeat and capable of reaching your goals. Additionally, look for new friends who share similar goals. Spend more time with these individuals because they’ll help you maintain your motivation. Consider spending less time with people who try to bring you down. If someone doesn’t support your goals, they likely aren’t a good friend for you. Making a mistake feels awful, but it’s a normal part of the process toward success. Everyone experiences failure, and sometimes it’s the only way for you to learn how to do something right. When you mess up, try to find the lesson in what happened. Then, try again.  For example, let’s say you audition for a role in a play but don’t get picked. You might talk to the director to find out how your audition could be better. Similarly, you might try to run a marathon but not be able to finish. This experience might make you realize you need to change your training regimen.
Summary: Track your progress so you can see how far you’ve come. Celebrate your small achievements to encourage you to keep going. Use positive self-talk to make you feel confident. Surround yourself with people who motivate you. Treat your failures as a lesson so you keep improving.

The very beginning of a basic chain stitch is easy — all you need to do is make a small, straight stitch in your fabric. The exact size doesn't matter, but it shouldn't be any larger than a quarter inch or so. This stitch will "anchor" the rest of your chain. To make a simple stitch, just bring the needle through the back of the fabric, then bring it through the front of the fabric near the first hole. Bring the needle through the back of the fabric a short distance below your first stitch. This new hole should be in line with the first two (not off to either side.) Bring the needle under the initial stitch from the side. You may need to use the needle tip to work the stitch open slightly. Pull the thread through so that it's reasonably tight (but not so tight that the fabric bunches up.) Next, put the needle point through the same hole that you came up through in Step 2. Your stitch should look like a skinny oval or slit. You've just made the first "link" of your chain! Now, all you need to do is just repeat the steps above to continue your chain. Bring the needle through the back of the fabric at a spot that's about as far from your first link as you did before. This time, pass the thread underneath both threads in the "link" of the chain. Then, put the needle down through the same hole you came up through. Your chain should now have two links. Simply continue this pattern to continue adding links to your chain.
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One-sentence summary -- Start with a small stitch. Come back through the fabric near your stitch. Loop the thread through the first stitch. Put the needle back through the second hole. Come back through the fabric below your stitch again. Loop the thread through the previous link. Repeat as needed.

INPUT ARTICLE: Article: The last thing you want to do is to tear a hole into your wall only to find that it's not feasible to put a door there. Before you go about drilling and tearing down, check for the following things:  Check if there's enough room in the wall. You need just over twice the width of the door (so it can hide). Check if the wall is load-bearing or just a partition. If it is load bearing, you'll need a new header and a means of temporary support while the door is being worked on. Check for wiring or plumbing. A wall with pipes in it is not a good place to put a door. Wiring can be easily detected with a cheap voltage sensor. If you're replacing a door with a pocket door, you'll need to get rid of the existing door. Start with removing the molding and, with a reciprocating saw blade, cut the shims. When the nails are cut, you can remove the door frame. Door jambs aren't nailed against the studs in the wall – they're just spaced with wooden shims.

SUMMARY:
Check the wall. Remove the existing door, if applicable.