Itching, mild or more severe, can be an indication that you have an outer ear infection. You may itch inside your ear or along the outside. However, a slight itch doesn't automatically mean you have an outer ear infection. Any kind of drainage from the ear can indicate an ear infection. However, look for drainage with color--yellow or green. Also, if the drainage smells bad, that could also indicate an ear infection. If you have pain in your ear, it could indicate an ear infection. If you press on your ear and the pain worsens, that's even more likely to be an indicator of an ear infection. In severe cases, pain may begin spreading across your face, which means you need to get to a doctor immediately, as the infection is spreading. Look at your ear closely in a mirror. If you can see some redness, that may also indicate an ear infection. Hearing loss is a more advanced symptom of ear infections, so if you begin to notice your hearing going in an ear along with other symptoms, that is definitely a reason to see a doctor. At its most advanced stage, your ear canal will be blocked completely. If your ear or lymph nodes swell, that is a far progression of an ear infection. Another advanced symptom is a fever.
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One-sentence summary -- Notice itching. Look for drainage. Pay attention to pain. Check for redness. Notice hearing loss. Look for the advanced symptoms.

Visit your local library or a bookstore to begin reading about electronics. Even older books have a lot of information about electrical circuits and how they work. Use it to study the basics before you begin building your own circuits. Try books like Make: Electronics, The Art Of Electronics, or Foundations of Analog and Digital Electronic Circuits. For more resources, search online for informative websites and digital book copies. Search your phone's Play Store to find a number of informative, hands-on apps. Some apps teach you the basics of electronics, while others let you design your own circuit board using a touchscreen. For example, try Electronics Basics or ElectroDroid. An electrical current consists of electrons, which are the negatively charged particles in atoms. In a current, the electrons flow from a negative source, such as a battery terminal. Then, it flows around the circuit and returns to the positive terminal. You can think of it like a faucet. When the faucet turns on, "water" is pushed through until it reaches the end of the pipe. Voltage is a measurement of the force needed to make a current flow through a circuit. In a circuit, the electrons accumulate near the battery's negative terminal. Energy is needed to get the current to flow through the circuit, and this measurement is the voltage. Think of it as pressure in a water tank. When water is drained from the tank, the pressure goes down and less water flows out. Resistance slows the current in a circuit. Different materials inhibit electricity more than others. You will need a stronger electrical current to pass through insulation than a conductive material like metal. This increases the voltage. For example, imagine water pipes of different sizes. Water faces more resistance flowing through the smaller pipe due to the lack of space. Electrical diagrams and schematics use symbols to denote components. Before you can copy one to build your own circuit, find out what the symbols mean. Search online for a list of symbols used as shorthand in diagrams. The straight lines are wires. A battery is represented by a + sign followed by a long and short straight line. Diodes, for example, are represented by triangles. Resistors are represented by squares or jagged lines.
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One-sentence summary -- Read books to learn the fundamentals of electronics. Download a phone application to study electrical engineering. Study how a current travels along a wire. Read about the voltage in a circuit. Study the resistance factor of different objects. Read circuit diagrams to understand the notation.

Always unplug the vacuum before performing any maintenance. Look at the entire cord for breaks in the plastic, exposed wire, or fraying. If you see any of these, don't use the vacuum because you could get shocked. If the cord is damaged, take the vacuum to a vacuum repair shop. They can inexpensively repair or replace the cord. If your vacuum is covered in dust or dirt, you'll spread it around your home as you vacuum and the dust could clog the machine's filters. Rub a damp cloth over the entire surface of the vacuum to remove built-up dirt. Ensure that you clean where pieces attach or connect. Removing dust and dirt from these areas can make a tighter seal so the vacuum works more efficiently. Take all of the attachments off of the vacuum and check them for cracks. Most vacuums come with a narrow extension wand, a dusting brush, a flat upholstery tool, and a power or turbo brush. Wipe dirt or dust from these attachments and pull away hair that might be tangled or stuck in them. For example, if hairs are caught in the turbo brush blade, take a pair of scissors and cut the hairs free from the bristles. Pull out the long stretchy hose and wipe the length of it with a damp cloth. Then, stretch it until it's straight and hold it down to the ground. Get down and look into it to see if the hose is clogged. If it is, take a bent wire or metal hanger and carefully insert it into the hose. Pull on the clog to loosen and remove it. If the hose is clogged, you might notice a loss of suction when you vacuum. Use caution when you insert the wire into the hose since you don't want to accidentally puncture the hose.
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One-sentence summary -- Unplug the cord and inspect it for fraying or breaks. Use a damp cloth to wipe dust off the outside of the vacuum. Inspect all of the attachments and remove dirt or hair from them. Wipe down the hose and remove any dirt clogs.

At birth, a newborn's skin may be reddish or pinkish. However, the baby's hands and feet may be bluish (acrocyanosis) because blood and oxygen are not yet circulating fully to the extremities. As the newborn's circulatory system opens, this bluish color will subside. If your newborn's skin is bluish all over (cyanosis), however, let your physician know right away. If your skin is dark, you can expect that your newborn's will be lighter than yours at first. Newborns with fair skin may show some mottling, with blotches of reddish and whitish skin. There may be pink patches over a newborn's eye or in the middle of his or her forehead. These are called Nevus simplex, commonly known as "angel kisses" or "salmon patches." Usually, these fade within a few months, although they may be faintly visible afterwards. Occasionally, a similar patch may be visible on the nape of a newborn's neck. This is often called a "stork bite" and will also fade or become less noticeable in time. Because birth can be a physically demanding experience for both mother and baby, a newborn may have some bruising. This may show as patches of blue or other colors on the baby's skin at various places. This is not usually a cause for concern, however. Your physician will examine your newborn, including any bruising (if present), and make sure that he or she is ok.
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One-sentence summary --
Note your newborn's skin tone. Look for common color patches. Don't be alarmed if there is some bruising.