Article: This pipe is considered "pure" because all you need to make it is an apple and stick-like device, such as a pen, with a tip sharp enough to poke a hole in the apple.  Make sure the apple you use is fresh. A soft apple could collapse while you're trying to bore the holes. It's ideal to use the type of ball-point pen with a tip you can unscrew so you can take out the ink well. Otherwise, you may spill ink all over the apple. Once you take out the ink well, screw the tip back on. Don't use a pencil. It's likely to break inside the apple while you're trying to make a hole with it.
Question: What is a summary of what this article is about?
Get an apple and a pen.

Problem: Article: Incognito mode keeps the websites you visit from placing cookies on your computer. If a website notices that you've searched for the same flight multiple times, it will often automatically raise the ticket prices. If you browse in Chrome or Safari, press Control + Shift + N to open incognito mode. If you use Firefox or Internet Explorer, press Control + Shift + P.  Putting your browser in Incognito mode is especially important if you search on different days of the week. Otherwise, old prices will sometimes display in lieu of new ones, and you may miss out on the best price. If you'd rather not use your browser's Incognito mode when looking for tickets, delete your cookies after each visit to a travel site. Aggregator sites are a great tool to use if you'd like to shop around and compare multiple airlines against one another. Type in your departure and arrival airports and days of travel, and scroll through the different flight combinations until you find the cheapest. Many aggregate sites also have a low-fare calendar so you can see which are the cheapest days to travel in a 30-day period.  If you don't mind putting in a little more work, visit the cheapest airline's website after you've compared it with others on an aggregator site. Some airlines will offer special deals and discounts if you buy tickets directly from the site. Popular flight aggregator sites include Priceline, Travelocity, and Expedia. Budget airlines can afford to mark down their tickets because they don't offer in-flight conveniences like Wi-Fi, complimentary snacks, and reclining seats. Flying on these airlines can sometimes cost less than half as much as a flight on a more luxurious provider.  If you're flying with the U.S., Hawaii, and the Caribbean, check out airlines like Frontier, JetBlue, Southwest, and Spirit. Or, if you're flying in Europe, try booking through Norwegian Air.
Summary: Search for cheap airline tickets using your browser's incognito mode. Compare different airlines' ticket prices with aggregator websites. Fly on a budget airline if you don't mind flights without amenities.

This is reverse polarity. As you are welding, keep your electrode extended between ¼” and 3/8” from the contact tube. This will help make for a clean, regular weld. Use carbon dioxide as an economical choice to provide deeper penetration on steel. This will be too hot for thin metals though. Use argon for aluminum welding, and a mix of argon (75%) and carbon dioxide (25%) for thinner steel. The angle should not exceed 10 degrees in either technique. Keep the wire at the front edge of your weld pool. This will give you greater control over your weld.  Drag welding pulls the bead along with the tip. This will give you a deeper penetration and a narrower bead. Push welding pushes the bead with the tip. This will give you a wider bead. Use the welder to place material directly into the joint. You can use a back and forth method to fill large gaps. For flat joints, hold the gun at a 90° angle. You must lower the gun angle slightly to keep the filler from sagging. Keep the same push or pull angle as normal. Use a back-and-forth weave motion to fill large gaps. Keep the amperage the same as a flat weld. You may need to use a slightly smaller diameter wire to keep the weld pool from getting too big. For thin materials, start at the top and move the pool down with gravity. This keeps the arc from penetrating the material. For thicker metals, start at the base and work up. This will help increase penetration. You may want to lower the amperage by around 10-15% to help fight gravity. Use standard welding techniques, but increase your travel speed. This will help prevent filler from falling out of the joint. You may need to increase your gas flow rate. Keep your nozzle clean, as spatter will build up faster when welding overhead. Once you are done with the weld process, grind off any excess filler. If the weld is defective, grind it down and re-weld the joint.
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One-sentence summary --
Set the welding machine polarity to DCEP. Keep a consistent electrode length. Use the proper shielding gas. Weld a joint using a drag or push welding technique. Make a flat weld. Make a horizontal weld. Make a vertical weld. Make an overhead weld. Finish the weld.