Make sure to be far enough from the top of the water that you can rotate all the way without your legs or arms coming out of the water. This isn't necessary for the flip, but the effect is somewhat diminished if the whole flip isn't completed underwater. Your back should be perpendicular to the bottom of the pool. Since the force which will generate the flip will come all from your arms, curl your legs to stop them from providing resistance or coming out of the water. Have your palms facing down. You'll use your arms in a sort of doggy paddle to propel yourself in a flip. As you move in the flip, try to keep your arms at your side and parallel to your body, moving them together. To initiate the flip, tilt your head back and and start arching your back. Paddle as though you're trying to lay flat, parallel to the surface. Keep your legs curled as you move, and be sure to follow your back/head with your upper arms. Once your back is parallel to the surface, paddle with your arms and arch your head and back to keep flipping. Next is to be perpendicular to the water's surface, head facing the bottom of the pool. Once upside-down in the water, you can extend your arms towards the bottom of the pool for more resistance and leverage. Face your palms forward, and push with your arms until they form a right angle with your body. You should once again have your back parallel to the bottom of the pool, but with your head facing the surface of the water. To avoid them coming out of the water, move your arms to side (like a breast stroke) and push down towards the bottom of the pool to right yourself. You should finish in the same position you started in, back straight and perpendicular to the surface of the water.
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One-sentence summary -- Get underwater. Float with your back straight, with legs curled. Keep your arms at your side, in a right angle. Bend your head and back backwards and begin paddling. Continue paddling and pushing your head back. Extend your arms and continue with your back. Push your arms to the sides and complete your flip.

Q: If you're trying to record in the room that has a problem with echoes, a shotgun microphone can help keep unwanted sounds out of your recording. Usually, they pick up echoes much less than standard microphones on laptops or phones do. Find shotgun microphones online or in a local electronics store. Generally, microphones pick up sound best when they're about 4 inches (10cm) away from your mouth. If it is further away, it may start to pick up the room's echoes more. Before recording, use headphones to test how your microphone is picking up sounds. If it is picking up echoes, try moving your microphone closer to your mouth. If that doesn't work, try moving the microphone to the part of the room that echoes the least.
A: Purchase a shotgun microphone for recording. Place the microphone close to your mouth. Use headphones to troubleshoot.

Article: Most centrifuges are about the size of a toaster oven and sit on a counter, tabletop, or other laboratory surface. Before you worry about adding liquid into the centrifuge, confirm that the surface the centrifuge sits on is completely level. A slanted surface will skew results or send the equipment falling to the floor. If you have a carpenter's level handy, you can confirm that the surface is completely level. Set the level on the tabletop or counter, and make sure that the horizontal bubble is completely centered in its glass tube. If you're using a very large centrifuge that rests directly on the floor of your lab, you can skip this step. Different size centrifuges will take different sizes of tubes. In general, larger centrifuges take larger microtubes. Putting the wrong size tube in a centrifuge could result in a messy spill, or could damage the centrifuge or the tube. If you're confused about which size microtube to insert in which size centrifuge, consult a more experienced laboratory technician. Or, consult the manual for the centrifuge you're using. Most tabletop centrifuges take a 1.5 milliliters (0.05floz) microtube or a 0.5 mL tube. Use a laboratory dropper to pour the exact same amount of liquid into each of the microtubes that you'll be inserting into the centrifuge. For example, if you fill the first microtube with 10 milliliters (0.34floz) of solution, make sure that all of the other microtubes you plan to use for the experiment are filled with 10 milliliters (0.34floz) of solution. A microtube filled with 9 milliliters (0.30floz) or 11 mL could unbalance the centrifuge. As their name suggests, balance tubes are inserted into the centrifuge to provide enough weight to balance out the other microtubes. Use a laboratory dropper to fill the balance tubes with liquid, so that all microtubes weigh the same amount. Or, if your microtubes have marks on the side indicating the amount of liquid in the tube, make sure that all tubes are filled to the same level. Balance tubes are commonly filled with water. However, if the solution you're using in the experiment has a density much higher or lower than that of water, use a liquid with a similar density in the balance tubes.
Question: What is a summary of what this article is about?
Make sure the centrifuge is on a level, stable surface. Select the correct size micro tubes for your centrifuge. Fill all of your microtubes evenly. Fill all of your balance tubes to the same level.

Article: Examine your own treatment of your classmates. Is there anyone you may be bullying, even unintentionally? If you ever pick on someone, even if you wouldn't consider it bullying, you should stop. Try to be nice to everyone, even if they're not your friend. Be careful teasing someone unless you're good enough friends with them to know that they won't take it personally. You should also avoid spreading rumors or gossiping about people. Avoid talking about people online or sharing pictures of them without their permission. If you see someone getting bullied in your school, stand up to the bullies. Not participating isn't going far enough. Make sure that you are actively taking a stand to prevent the victim from getting harmed further. You can interfere by speaking with the bully if you feel safe doing so, or telling a school administrator what you saw. If your friends start gossiping about someone, make it clear that you don't participate in that kind of thing. Try saying something like, "I don't like gossip. Can we talk about something else?" If you're part of a group that's intentionally leaving someone else out, tell the group you want to include everyone, because it's the right thing to do. Try saying something like, "I think we should be nicer to Catherine. It must be hard to be the new girl in school." If you see someone getting picked on and fear for that person's safety, tell a teacher or school administrator right away. Try saying something like, "I am worried about David. I have noticed that some of the older boys harass him when he is walking home from school." Many schools have anti-bullying campaigns led by students who want to keep their schools safe and friendly. Join a group or start one at your school to spread awareness about the problem of bullying and figure out ways to solve it. Try starting a conversation with your friends about bullying. You might say something like, "Did you know that bullying is still happening at our school? I think it is terrible and I would like to do something to stop it." Talk with your teacher or school counselor about ways you can help. For example, you might be invited to give a presentation on bullying in your class or you might be able to help organize an event to raise awareness about bullying.
Question: What is a summary of what this article is about?
Make sure you aren't participating in bullying behavior at school. Stand up for people if they're being bullied. Spread the word that bullying has to stop.