Article: Extensive reading works when you’re trying to determine the meaning of what you’re reading. This technique focuses on the overall picture. It’s best for things like studying a textbook, reading a newspaper article for information, or reading a book for school. If you want to read to understand something on a deeper level, like studying a textbook, it helps to read more actively. Keep a notebook out and make notes on important things you notice as you read.  For instance, you can make bullet points to summarize every time you come to a major idea. If there are key terms or dates in whatever you’re reading, make a note of those as well. If there are parts you don’t understand, write down the questions you have and come back to them later. If you’re able to write in or mark up whatever it is you’re reading, this can also help increase your understanding. For instance, you can underline or highlight important passages. You could also try things like circling key terms and writing notes in the margins. Every so often, stop and write a few sentences in your notes to summarize what you’ve read so far. Putting the main ideas into your own words and writing them out is a way of checking that you understand what you’re reading. Going back over the material also helps you remember what you’ve read.  If you have trouble summarizing or remembering any part of what you’ve read, go back over it again. You can also try writing out a summary in an outline form, rather than full sentences. When you encounter a word or concept that seems essential to a text's meaning, make a note of it. If you are reading a textbook, these might even be set apart in bold print, or in a separate vocabulary section. You can write the words or concepts down to study them later, or even make a set of flash cards.  If you come across a word or concept that seems important but is not clearly defined in the text, look up its meaning in a dictionary or encyclopedia (either online or print). If you see certain words being used over and over again, that’s another sign that they’re important for what you’re reading and worth looking up.
Question: What is a summary of what this article is about?
Try extensive reading if you’re looking for understanding. Take notes on your reading. Annotate your reading. Review what you’re reading by summarizing it. Identify key words and concepts.

Problem: Article: Look for puffiness around the kneecap or around the sides of the knee. Comparing your two knees is a good way to check to see if there is swelling or redness and to see if is something wrong.  There might also be swelling at the back of your knee. This could signal a Baker's cyst, which is when extra fluid is pushed into tissue behind your knee. It can cause swelling at the back of your knee which may worsen when you stand up.  If your affected knee is redder and warmer to the touch than the other knee, see your doctor. If you have discomfort when you move your leg, you may have some level of injury that needs to be treated. You may feel this discomfort as pain, pressure or stiffness. The stiffness and/or pressure will most likely be due to fluid in your knee. An injured leg may be painful to stand on. Try putting your weight on your leg and walking to see if your leg can handle load bearing exercise. While you may be able to diagnose swelling in your knee, you may not know the exact cause behind the swelling. It's best to check with your doctor if the swelling is persistent, painful, or doesn't go away in a couple of days. Some possible conditions that cause knee swelling include: an injury such as a torn ligament or cartilage; irritation from exerting your knee too much; osteoporosis; rheumatoid arthritis; gout; infection; bursitis; or other conditions.
Summary: Compare your affected knee with your other knee. Bend and straighten your leg. Test walking on your leg. See your doctor.

Do not touch the metal probes while connecting them to a circuit. If the insulation looks worn or torn, wear electrically insulated gloves or purchase replacement leads. The two metal probes should never touch each other while they are connected to a circuit, or severe sparking could result. Test circuits for voltage by attaching the leads in parallel. In other words, you'll touch the probes to two points an already-closed circuit, with current running through it.  On a battery, touch the black lead to the negative terminal. In a wall outlet, touch the black lead into the neutral hole, which in the US is the larger vertical hole, or the vertical hole on the left. Whenever possible, let go of the black test lead before moving on. Many black probes have a small plastic bump that can stick into an outlet. This will complete the parallel circuit and cause the meter to display the voltage.  On a battery, touch the red lead to the positive terminal. In a wall outlet, fit the red lead into the "hot" hole – in the US, this is the smaller, vertical or the vertical hole on the right. Immediately raise the range to a higher voltage setting if you get one of the following results, before your device is damaged:  Your digital display reads "OL," "overload," or "1." Note that "1V" is a real reading, and nothing to worry about. Your analog needle shoots to the other side of the scale. You may need to make adjustments if a digital voltmeter display reads 0V or nothing at all, or if an analog voltmeter's needle has barely moved. If there is still no reading, try the following in order:  Make sure the test probes are both connected to the circuit. If you are measuring a DC circuit and get no result, look for a small knob or switch on your device labeled DC+ and DC- and move it to the other position. If your device does not have this option, reverse the positions of the black and red probes. Reduce the range by one setting. Repeat if necessary until you get a real reading. A digital voltmeter will clearly display the voltage on its electronic screen. An analog voltmeter is a little more complicated, but not too tough once you learn the ropes. Continue reading for instructions.
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One-sentence summary --
Hold the probes safely. Touch the black test lead to one part of the circuit. Touch the red test lead to another point on the circuit. Raise the range if you get an overload reading. Adjust the voltmeter if necessary. Read the voltmeter.