Article: If it turns out that you must face a knife-wielding attacker one-on-one, start by backing away. Try to put as much distance as possible between yourself and the attacker. Experts recommend seven yards as a distance that will keep you safe from a knife attack. If you want to disarm an opponent or attacker, you will have to do so at the right moment. While you are waiting, you can protect yourself by using an object as a shield. Try to find a hard, rigid object such as a board or trash can lid, but any object (even a coat, blanket, etc.) can help. Hold the object in front of you to protect yourself against sudden attacks. A shield will help keep your vulnerable areas protected. Remember that your most vulnerable areas are at your core (chest, abdomen), so keep those protected above all. Try not to stand directly in front of the attacker; this makes you more vulnerable to attacks. Instead, remain to the side of the attacker if at all possible. That way, you will have a chance to see if the attacker turns to lunge toward you, and have slightly more time to react. If the attacker lunges at you before you are able to get the knife, step to the side out of his/her way. The attacker may then turn around to face you again. Be prepared and move to the side of the attacker, so that you can avoid direct stabs in your direction. If the attacker lunges at you and you are not able to get out of the way, grab the attacker’s arm as he/she moves toward you. Use both of your hands to grab on, if possible. Yank the attacker’s arm and use the attacker’s momentum to throw him/her to the ground, making sure to keep the knife pointed away from you. If the attacker lunges at you using an upward motion, use the blade of your hand to chop into the attacker's hand. Do this forcefully, and it will push the attacker’s arm backward. Use your hands to push and hold the attacker's arm back so that the knife stays away from you. Slam the attacker’s arm into a hard surface or apply pressure until the knife falls from his/her hand. If the attacker lunges toward you with the knife, back away and pretend to fall down so that you are still facing the attacker. Prop yourself up on your forearms, keep your left foot raised, and wait for the attacker to approach. When the attacker is within reach of your feet, put your left foot against his/her heel. Slam your right leg against the back of the attacker's knee as hard as you can, pushing the attacker away. If you do this correctly, your attacker will fall face first, with the knife aimed away from you.
Question: What is a summary of what this article is about?
Create distance between yourself and the attacker, if possible. Use an object as a shield. Keep your body perpendicular to the attacker. Block and redirect attacks. Deflect the attacker’s arm if he or she strikes. Stop an underhand knife attack. Throw the attacker from the ground.
Article: Grasp each half of the Oreo cookie softly but firmly with the fingertips of both of your hands. Being smooth and stable is the key here. Don't grasp the Oreo too tight, and definitely don't wiggle the cookie back and forth. Grasping too tight or wiggling may lead to the filling failing to separate cleanly.  Make sure that both the Oreo and your hands aren't too warm. Warm hands will warm the Oreo and soften its filling, making it more gooey and sticky. A warm Oreo is harder to separate. Don't grip the Oreo for too long. The longer you hold the Oreo without starting the next step, the more likely it is to start to warm up. With proper technique and a little luck, you should have one half of the Oreo that is completely clear of filling and one half with all of the filling. If so, success! If not, don't worry. This only means that you need to practice by separating (and eating!) more Oreo cookies.
Question: What is a summary of what this article is about?
Properly grip the Oreo. Admire your Oreo.
Article: Use your brush to clean the bottom and sides of the pool again, then vacuum up all the dead algae. If there are a lot of dead particles and you're having trouble vacuuming them, you can add a flocculent to help the algae bind together and make it easier to vacuum. Your swimming pool water should be crystal clear after treatment. If the algae seems to be coming back, go through the shocking and treating process again until it's all cleared away. All chemical levels should be in the normal range.
Question: What is a summary of what this article is about?
Vacuum up the dead algae left behind in your swimming pool. Run the filter until the algae is gone. Re-check chemical levels with your swimming pool test kit.