Meet America's first NFL coach

Just days after her final preseason game, Yahoo Global News Anchor Katie Couric sat down with Jen Welter, the first female coach in National Football League history, who worked as a summer preseason intern with the Arizona Cardinals.

Usain Bolt beats Justin Gatlin in World Championships 200m final

Bolt unleashed his signature 'Lightning Bolt' during his victory lap

Usain Bolt won the rematch and 200m gold as he ran a wonderful bend to once again leave rival Justin Gatlin chasing silver and fresh air.

On a sweaty, sticky night in the Bird's Nest, Bolt was out of the blocks quicker and opened up an unassailable lead over the first 100m before coming away down the straight and jabbing his thumbs at his chest as he crossed the line.