Recycled Tennis Balls Could Protect Buildings from Earthquakes - Scientific American
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How often are tennis balls replaced at Wimbledon – and what happens to the used ones? - Daily Star
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10 Unusual Uses for Tennis Balls : 11 Steps (with Pictures) - Instructables
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Why tennis balls are yellow -- or maybe green - CNN Style
10 Clever Uses for Old Tennis Balls – Holabird Sports
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10 Clever Uses for Old Tennis Balls – Holabird Sports
