Olympic 100m final - Can Usain Bolt make history?

Usain Bolt
It is the question that has followed Usain Bolt for the past four years, the answer to which will not truly be known until the final for the men's 100 meters sprint in London has been done and dusted.
Just how fast could he have run on that night in Beijing?
It seems a crazy thing to ask. After all, the Jamaican smashed the world record with a time of 9.69 seconds, winning gold and saving the Olympics' marquee sport from itself after successive drug scandals.
And he has run faster since, setting a new record a year later at the World Championships with a time of 9.58 seconds.
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