The precise amount in the can makes all the difference to its balancing ability. This amount isn’t precise (not without a heaping helping of math), so you will have to adjust as necessary. You want to tip the soda so that it rests on the groove that encircles the bottom of the can. Take care, as the movement of the liquid will cause the balance of the can to teeter until the liquid comes to rest.  You’re looking to reach the center of balance between the can and liquid inside. On most soda cans the amount of liquid required will be the same, but this can depend on the size of the can. Keep trying until you get the feel for the tilt and the balance. Work slowly! Move too hastily and you will spill the soda everywhere. Keep your hands close to the can on your first tries so you won't spill it everywhere. If the can will not balance, you may have to drain additional liquid from the can, or even add more liquid. Lean the can "backwards", away from the opening you drink out of.  That way, if it does fall over, you can pick it up again before much spills out. Once you have mastered balancing the can at a 45 degree angle, try giving it a gentle push.  It will slowly roll around on its edge and look even more astounding. Behold the power of science!
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One-sentence summary -- Empty out one half to one third of a soda can. Tilt the can at a 45 degree angle. Observe and adjust. Give the can a little push.


Cut a medium or large cucumber a third of the way from the end, or a small cucumber in half. The exact size is not too important, but the piece you are about to carve should include both an end and a cut surface. Keep the remaining portions around, as successfully creating a flower for the first time often takes more than one attempt. Take a sharp, stainless steel paring knife and place it against the edge of the cut end. Slice off about 1/8 of the circumference of the cucumber, just barely beneath the green skin. Move the knife slowly under the skin, to within 1/2 inch (1.25 cm) of the end. Remove the knife, leaving the strip of skin attached to the end. If the strip breaks, you can still continue to use the same cucumber piece as practice. Repeat this process until all of the green skin has been formed into strips, or "outer petals" of the flower. Once again, use your paring knife to create thin strips starting from the cut edge of the cucumber. This time, you will be forming "inner petals" of the flower, from the hard, white portion of the cucumber. This may be more difficult than the peel, as you need to create strips thin enough to bend, but thick enough that they won't break. Go slowly, and take a break if your eyes or hands feel strained. Carefully scrape the seeds and pulp out of the center of the cucumber using your knife. If there is still white flesh not turned into strips, you may remove this as well. Use the knife or a pair of scissors to trim the end of each "petal" into a triangular point. Try to cut each triangle to the same length for a more attractive, symmetrical effect. Mimic the pollen center of a flower by cutting a small disc from a carrot, and inserting it at the base between the strips. Other colorful, edible options include a small berry, a circle of tomato peel, or even an actual flower. Small, edible flowers that may look attractive in this position include dandelion buds, clover, or English daisies.
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One-sentence summary -- Cut off a section of cucumber. Create a strip by slicing just beneath the skin. Make additional strips around the whole cucumber section. Carefully turn the white flesh into strips. Remove the seeds. Trim the petals to a triangular point. Add a colorful center.


Begin with your feet shoulder width apart facing the net. Your dominant arm should be directly in front of you, palm up, with the ball in your palm. You should be at least 5–8 feet (1.5–2.4 m) behind the line to have enough space for a 3-4 step approach. Aim to hit the ball just above the center of the ball. Unlike in a basic overhand serve, don't stop your arm when you hit the ball. Swing all the way through and snap your wrist. If you can't get the snapping motion, practice. This wrist snap is what makes a top-spin serve powerful and unique. Practice perfecting the snap of the wrist along with hitting the ball correctly to send it sailing over the net.
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One-sentence summary -- Set up your stance. Learn how to hit the ball with your hand.


The bigger the number, the more accurate your calculation will be. x * sin(180 / x). For this to work, make sure your calculator is set to Degrees. The reason this is called a Limit is because the result of it is 'limited' to pi. As you increase your number x, the result will get closer and closer to the value of pi.
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One-sentence summary --
Pick a large number. Plug your number, which we'll call x, into this formula to calculate pi: