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https://en.wikipedia.org/wiki/Ovoidhttps://en.wikipedia.org/wiki/Ball_gamehttps://en.wikipedia.org/wiki/American_footballhttps://en.wikipedia.org/wiki/Marbleshttps://en.wikipedia.org/wiki/Jugglinghttps://en.wikipedia.org/wiki/Engineeringhttps://en.wikipedia.org/wiki/Ball_bearingshttps://en.wikipedia.org/wiki/Black_powderhttps://en.wikipedia.org/wiki/Projectilehttps://en.wikipedia.org/wiki/Rubberhttps://en.wikipedia.org/wiki/Christopher_Columbushttps://en.wikipedia.org/wiki/Mesoamerican_ballgamehttps://en.wikipedia.org/wiki/Sphere