In one sentence, describe what the following article is about: Making your own rocket fuel is a fun DIY science project you can do at home. However, you'll be working with potentially volatile chemicals, so it's important to take some basic safety precautions. These items will keep you from coming into direct contact with hazardous substances. Elbow-length pair of laboratory or dishwashing gloves is preferable, but a pair of disposable latex gloves will also work just fine. Clear goggles, like the kind worn in chemistry labs, are ideal, as they provide full coverage without hindering your vision. Add 58 grams (2.0oz) of potassium nitrate and 29 grams (1.0oz) of sugar to the container, then shake it vigorously until they're evenly distributed. In order for your rocket fuel to burn properly, it's important that your dry ingredients be well-sifted. Use a kitchen scale to portion out your ingredients to make sure you have exactly the right amount of each. It's recommended that you do your mixing in a disposable drinking cup. That way, you can simply throw it away once you've completed your experiment. If you use a measuring cup or similar container instead, be sure to wash it thoroughly before reusing it. This is where you'll actually be cooking the various ingredients down into usable fuel. When combined, they'll produce a malleable sugar-based substance that will burn intensely for a short period of time. Sugar-based model rocket fuels are sometimes known as "R-Candy." They work by feeding a steady supply of oxygen to the burning sugar via an oxidizer (in this case, potassium nitrate) to create a powerful, sustained form of combustion. After shaking the blended potassium nitrate and sugar into the saucepan, drizzle in 13 millilitres (0.055c) of Karo syrup. Pour in 80 millilitres (0.34c) of water last, then stir all of the ingredients together thoroughly. The added moisture will help dissolve the sugar, which will act as a binder for the solid fuel. You may need to use a spatula or similar utensil to scrape the last of the Karo syrup out of its measuring container. Turn on the stove or burner to medium heat and bring the mixture to a simmer. As it warms up, it will gradually begin to thicken into a gritty paste. If possible, set up a portable burner outside far away from any other flammable substances. Never heat rocket fuel on a gas cooktop or over an open flame! Combustible chemicals plus fire can make for a disastrous combination. This will prevent it from sticking to the saucepan. You'll know it's ready when it takes on a color and consistency similar to peanut butter or wet sand. Once the reaches this stage, it may help to fold it over on itself rather than attempting to stir it like normal. Be careful not to stir the mixture too fast, or you could accidentally send it sloshing out of the saucepan. Your rocket fuel may also come out a slightly lighter hue, depending on whether or not the heat causes the sugar to caramelize.
Summary: Grab a pair of gloves and some protective eyewear. Mix the potassium nitrate and sugar together in a separate container. Transfer the potassium nitrate and sugar to a saucepan. Add the Karo syrup and water to the saucepan. Heat the ingredients on an electric cooktop for 5 minutes. Stir the fuel mixture constantly as it thickens.

In one sentence, describe what the following article is about: Put a new speculum, or pointed end, onto your otoscope before each patient. Select the largest possible speculum that your patient's ear will accommodate. When inserted, the speculum should fit snugly into the outer third of the ear canal. Speculums that are too small can cause discomfort and reduce how much of the ear you can examine. Use the following guidelines for speculum size: Adults: 4 to 6 millimeters Children: 3 to 4 millimeters Infants: as small as 2 millimeters Without using the otoscope, take a look at the person's external ear and notice any redness, discharge or swelling. Manipulate the ear gently and ask the patient if there is any pain. With Swimmer's ear there is often pain, swelling, redness, and discharge that can be observed before even using the otoscope. Place the otoscope at your patients ear, not in it. Look into your otoscope and then slowly insert the pointed end of it into the ear canal. Steady your hand on the side of the individuals face if necessary. Slow and gentle insertion can prevent unwanted movement in your patient. It also keeps your hand and scope in line with the ear and minimizes the risk of injury. Avoid putting too much pressure on the otoscope, which can bump the inner canal wall, causing the patient discomfort. Avoid ramming the speculum into the ear canal. Insert it at most 1 to 2 centimeters and then use the light to view beyond the tip of the speculum. Stop the examination immediately if the patient expresses any pain or discomfort. Examine the middle ear and eardrum. Angle the tip of the otoscope towards the person's nose. This follows the normal angle of the ear canal. From here, move the otoscope gently at different angles. This allows you to view the person's eardrum and canal walls. Stop the exam at any sign of increased pain or discomfort. Return the otoscope back to your starting position. As you watch through the speculum, gentle take the speculum and scope out of the person's ear canal and outer ear. Release the person's ear from your grasp. Remove the speculum from the otoscope. Throw it away in a certified medical waste container to minimize the spread of disease or infection to other patients. If you don't have disposable speculums, scrub each tip with hot water to remove excess wax. Then soak the speculum in a covered dish of rubbing alcohol for 10 minutes.
Summary:
Choose the right speculum size. Examine the external ear first. Insert the otoscope slowly into the ear canal. Push the speculum 1 to 2 centimeters into the canal. Angle the otoscope. Remove the otoscope. Throw away the speculum.