Question: Stretch a rubber band between your two thumbs, and pluck it with your index finger. Better yet, stretch the rubber band in front of a
Stretch a rubber band between your two thumbs, and pluck it with your index finger. Better yet, stretch the rubber band in front of a windy fan to get it vibrating. Note that the area of greatest oscillation is always at the midpoint. This is a self-reinforcing wave that occurs as overlapping waves bounce back and forth from thumb to thumb.

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