'Concussion': 5 Takeaways From Will Smith's New Film

Watch the first trailer for this anticipated film.

Here are five takeaways and background you need to know before checking out the clip:

1 - It's Based on a True Story

Omalu is the forensic pathologist and neuropathologist who discovered chronic traumatic encephalopathy in football players who got hit in the head over and over again, according to the Washington Post.

In the clip, he says repetitive "head trauma chokes the brain."

2 - Smith's Version of Omalu's Accent Is Spot On

For comparison, here's Omalu's PBS interview from 2013.

3 - Smith Is a Reluctant Hero

"If you don't speak for them, who will," Gugu Mbatha-Raw, who plays Prema Mutiso in the film, tells Smith's character.

He admits he idolized America growing up and "was the wrong person to have discovered this."

5 - "Tell the Truth"

Smith captures Omalu's passion to have the truth told about this injury and disease.

"I was afraid of letting Mike [Webster] down. I was afraid. I don't know. I was afraid I was going to fail," Omalu told PBS a couple years back.

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