In an exhaustive review of all studies published through June 2012, "it has become clear there is no easy way to grade a concussion and no set timeline for a return to play" says Christopher C.

WSJ: Tougher Rules Advised for Athletes After Concussion

It's not just about a better understanding of communication over the ages, either, as the timeline of a language can also play a useful role in determining the order of pre-history events, such as the movement of populations over a continent.

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In keeping with this safer approach, there is no specific timeline or timetable when the athlete is safely expected to return to play.

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Just tap on any content unit in ConnecTV's "SocialTV Timeline" and it immediately springs to life, expanding to offer news, polls, play-by-play sports and more.

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