How to play Center the Cork

Learn the rules to the puzzle game Center the Cork quickly and concisely - This video has no distractions, just the rules. For the solution to this puzzle, check out this video: https://youtu.be/Nv94UKJ2G3A

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RULES:
Get a small cork and fill a glass with water. The object of the puzzle is to figure out a way to drop a small cork on the surface of the water so it stays in the center of the glass without touching any of the sides. The glass contain nothing but the water and the cork and you may not damage or alter the cork in any way. You may not connect anything to the cork.