Article: Purchase a broad-spectrum (also called a full-spectrum) sunscreen that will block both UVA and UVB rays. Get a sunscreen with a sun protection factor (SPF) of at least 50, the higher the better. Then, apply the cream to your skin at least 20 minutes before heading outside. This allows the sunscreen to begin working before you are actually exposed to the sun, thus preventing burning. As you consider various sunscreen brands, consider what activities you’ll be doing that will require protection. If you will be in the water, then you’ll want a sunscreen that is water-resistant. If you are hiking, you may need a sunscreen that includes insect repellant. You should aim to reapply your sunscreen at least every 90 minutes. This interval may need to be shortened if you are sweating heavily or spending time in the water. When you reapply, don’t rush. Make sure to coat all exposed parts of your body. For each application you can estimate using a nickel-sized portion on your facial area and two shot glasses worth of lotion on your body. It is almost impossible to apply sunscreen to your scalp and that makes this area very susceptible to burning. To prevent a painful head burn, wear a solid hat when venturing outdoors for extended periods of time. This will also offer some protection for your face as well. Your body will often tell you when it has had enough of the sun. Pause in your activities for a moment and evaluate your condition. Does your skin feel overly warm? Are you starting to notice feelings of tightness? Are you experiencing any pain at this point? If you answer “yes” to any of these questions, head indoors. If you are outside with other people you can always ask them to look you over. However, the reflection from the sun on your skin can often mask the visual signs of a burn, so it may be difficult for them to accurately gauge if you are headed in that direction. It can take up to six months for your skin to fully heal after a sunburn. If you are burned again during this interval, the healing process can come to a standstill. While you are healing, be careful with your body and limit your time in the sun.
Question: What is a summary of what this article is about?
Apply sunscreen before going out. Reapply sunscreen on a regular basis. Wear a hat. Pay attention to your body’s signals. Ask your friends to check you out. Be very careful when recovering.

Problem: Article: Just like with the letter, it's best to use professional letterhead if you have it. A pre-printed envelope looks more polished and authoritative than just a handwritten or even a typed envelope. If you don't have a letterhead envelope, place your address in the upper left-hand corner, starting with your name on the first line, followed by the rest of the address on the next lines: Ms. Rebecca JohnsonMuddy River High School 492 West Lane Big City, Arkansas 73234 The recipient's address should go over to the right on the envelope, centered from top to bottom. Start with the recipient's name. If you don't know the person's name, start with the office, such as the Office of Admissions, followed by the school's name and the rest of the address on the next lines. The address should look like the following example: Dr. Jordan Jones  Office of Admissions College of the Pines 2948 Northlake Boulevard Big Buck City, Oregon 42343 Often, a school will require you to seal and sign the envelope to verify that you wrote it. That just means that you sign it over the sealed edge of the envelope before sending it or giving it to the student to send. Know the deadline for the letter, and make sure you send it in on time or give it to the student. Missing the deadline could mean the student will be rejected for that school. Some schools will allow you to fax or email the letter. Check with the student to see if that's appropriate.
Summary: Use a letterhead envelope. Add the recipient's address. Seal the envelope. Mail the letter on time.

You'll need a venting system, but you'll have to choose between two types. There is rigid venting, which comprises a hard metal tube that works for distances no greater than 40 feet (12.2 m). There is also semi-rigid venting, which uses a flexible hose that works for no more than 20 feet (6.1 m).  In general, rigid venting is best for dryer vents that are installed at floor level. If you need to attach your dryer to a vent above floor level, you may need a semi-rigid vent hose. Or, if you use a rigid vent hose, you can attach a pair of elbow-shaped bends to the top (where the hose connects to the wall) and the bottom (where the hose connects to the dryer). Dryer vent hoses should be 4 inches (10.16 cm) in diameter. Use a metal vent hose rather than plastic or vinyl, as these are a fire hazard. Make sure the connections at both ends of the vent hose are secure. You can do this with hose clamps, duct tape, or foil tape. However, hose clamps are the most secure option, as tape can eventually dry out and lose its adhesive properties. Make sure that it is clear of lint and other blockages, and that the vent hood is still in place. Carefully clean out any buildup.
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One-sentence summary --
Attach a vent hose. Secure the vent with a hose clamp. Check your outside duct opening.