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Math and the FIFA World Cup footballs: https://youtu.be/G_-ZzR6OMqE <iframe width="930" height="565" src="https://www.youtube.com/embed/G_-ZzR6OMqE" frameborder="0" allowfullscreen></iframe>
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Testing embedding before making a thread. <iframe width="560" height="315" src="https://www.youtube.com/embed/9G4wARtfNZo?list=FLwvVHiHbNpSTIvuRNT0FxFQ" frameborder="0" allowfullscreen></iframe>