Physicists are currently hotly debating a topic some of us never think about -- or if we did -- surely we'd think 'there's an answer for that, even if I don't know what it is.

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Late last year a conference of coaches in Brazil was debating this very topic.

BBC: At what point is a game of football won and lost?

The issue continued to be a topic of discussion Tuesday, with commenters on CNN and other online venues debating what the unusual appearance meant.

CNN: STORY HIGHLIGHTS