Q: Do so by double-clicking on the blue Preview icon that looks like overlapping snapshots, then clicking on File in the menu bar and Open... in the drop-down menu. Select a file in the dialog box and click on Open. Preview is Apple's native image viewer app that's automatically included with most versions of Mac OS. It's in the middle of the drop-down menu. It's in the middle of the drop-down menu. A text box with the word "Text" will appear in the middle of the document. It's on the right side of the toolbar just above the document. A dialog box will open. Click on the font drop-down to change fonts. Click on the colored-rectangle to change the color of the text. Click on the font-size to change the size of the text. Click on B to make the text bold, I to make the text italic, or U to underline the text. Use the buttons at the bottom of the dialog box to select an alignment for the text. Your text additions are now saved in the PDF document.
A: Open a PDF document in the Preview app. Click on Tools in the menu bar at the top of the screen. Click on Annotate. Click on Text. Click on and drag the text to position it where you want it on the document. Click on A. Double click on the word "Text." Type the text you'd like to add to the PDF document. Click on File in the menu bar and Save in the drop-down menu.

Article: Lab-created sapphires are essentially glass that is put through a process similar to the one that forms natural sapphires. Since they are glass, tiny air bubbles remain in them after they form. If you see any bubbles inside of the sapphire then it is not real. Be sure to turn the sapphire over and inspect it from every angle. It's possible that air bubbles will only be visible from one angle. If you have two sapphires and you know for sure one is real, use it to scratch the second one. Gems of equal hardness can't scratch each other, so if both are real sapphires then nothing will happen. If the real sapphire leaves a scratch on the second sapphire, then the second one is not real, or is at least of lower quality. This test can damage a synthetic sapphire, so be wary of ruining the inferior gem. Turn the lights off in a room and shine a flashlight on the sapphire. If the sapphire is real, it will only reflect light that is the same color as the sapphire. If it is fake, meaning it is made of glass, it will reflect other colors besides the color of the gem.
Question: What is a summary of what this article is about?
Check the gem for air bubbles. Use the scratch test. Watch how light reflects from the sapphire.

Problem: Article: You don't need to stock up on fancy cat toys to have fun. You may have something your cat would love just lying around the house. If you have any ping pong balls, or similar types of balls, your kitten will love playing with these. Bounce a ping pong ball against the wall and allow your kitten to chase it. Ping pong balls bounce easily, so they'll move around fast. This is sure to attract a kitten's attention. Place a small plush toy under a blanket. Wiggle it around so your kitten thinks it's a mouse or other animal. Your kitten will pounce on the toy and get plenty of fun playing a game like this. For an even more economical cat toy, you can also make balls out of crumpled paper. This DIY cat toy creates a rustling noise that cats are evolved to pay attention to due to its likeness to the rustling sounds made by small animals e.g. in a bush. Also, the imperfection in the roundness randomizes how it will roll on the floor. Unlike a ping pong ball, a paper ball would not travel too far, so this limits the playing into a smaller area and makes playtime easier to manage. However, make sure it's an old blanket if your kitten is not declawed. Kitten claws can seriously damage fabrics. You may not want to play this game if you let your kitten sleep in your bed. This may encourage your kitten to pounce on your feet while you're trying to sleep. If you get home from the grocery store, place a paper bag on the ground. Many kittens love playing in paper bags. You can take a small toy and poke the sides of the paper bag with it. This will give your cat something to play with inside the paper bag. You can also set down a paper bag while playing with a ribbon or string with your cat. The kitten will use the paper bag as a hiding spot from which to jump out at their prey. Kittens love play hunting. In the wild, play is a form of practice for hunting later in life. Your kitten will love having small plush toys to stalk. Choose toys big enough for your kitten to carry in its mouth. You can throw these toys around for your kitten like a ping pong ball. However, plush toys are also great as your kitten will play with them on its own. This can help keep your kitten entertained while you're out of the house. Plush toys that can be filled with treats are also a great way to keep your kitten occupied. Every kitten has different preferences when it comes to toys. If your kitten doesn't like a certain toy, don't try to force it. Buy a variety of types of toys for your kitten and see what it takes to.
Summary: Use a ping pong ball. Hide a stuffed toy under a blanket. Let your kitten play in a paper bag. Provide your kitten with plush toys. Use trial and error to figure out what your kitten likes.

Q: The general rule for lure color is "bright day, light colors; dark day, dark colors." On bright, sunny days and in clear water conditions, choose lures that are light in color and mimic natural patterns. On cloudy days and in dirty water conditions, choose darker lures and those with a non-natural coloration, preferably types that make noise or vibrate as they move through the water. A notable exception to this rule is the use of 2-toned plastic worms that feature a darker head color and a fluorescent pink or yellow tail color. Many anglers use plastic worms colored like this when fishing in cloudy water conditions. In general, choose smaller jigs and grubs when fishing for panfish (bluegill, sunfish, crappie, perch) and larger lures such as spinnerbaits and crankbaits when fishing for bigger fish (bass, walleye, and pike). Smaller lures are best suited for light and ultralight spinning and spincasting tackle (or fly rods in the case of dry and wet flies) with lines of 4 to 10-pound test (2 to 5 kg class), while larger lures are meant to be fished with medium to heavy action rods, spinning or baitcasting reels, and lines of 12 to 20-pound test (6 to 10 kg class) or better. (Lures used to fish for muskellunge, the largest member of the pike family, are decidedly larger than those used for bass, walleye, and northern pike, and often require the use of a wire leader because of the muskie's sharp teeth.) Lure size can also be dictated by weather conditions and how fish react to them. In early spring, or when cold front conditions clear the skies and cool the water to make fish lethargic, smaller lures are usually better choices than larger lures. (Lures used for ice fishing are exceptionally tiny, usually grub jigs or small spoons.) In high-wind conditions, you may need to use a larger lure simply to have enough resistance on the end of the line to keep the wind from bowing it so that you can't detect if fish are hitting the lure. Also try casting out a spinner and just keep casting and retrieving the lure.
A:
Choose lure colors according to weather and water conditions. Choose lure size according to the tackle you're using and the species you're fishing for.