For tens of years, humans have been trying to run a mile in under four minutes.

So many runners try to break that record, and none of them could.

Everyone thought it was impossible until one day in 1954 1 guy with no proper training ran so fast that he finished a mile in three minutes and 59 seconds, one second shorter than four minutes.

He became the first person in the world to do so.

Yes, now you may find that interesting, but what happened after was way more interesting.

Immediately after people realized that running a four minute mile, he's not that impossible.

So they ran faster and faster and faster, and a no time thousands of people could run a mile in under four minutes.

In fact, some could run it in three minutes and 43 seconds, 70 seconds shorter than what used to be impossible.

Now you may think this video is about sports, but it's really not.

This is about role models because they are more important than we think.

See, the minute someone breaks the impossible, our mental block is gone, and we tell ourselves.

If they can, then we can.

It's no longer impossible.

And this isn't just sports.

I saw this everywhere around the world when Isaiah, in Compton, Los Angeles, Hamas and I'm a 70 year old pilot, became the youngest African American pilot to fly around the United States.

He made the kids in his neighborhood, believed that they, too, can fly and become pilots.

For them, skies became the limits literally.

Even here at NASA.

Dealing with these video succeeded on Facebook.

Many people realized that they, too, can make videos, and now they have millions of followers.

After learning about the four minute mile, I fully understood how important role models are.

Bag or models can ruin us and set a bad example.

Good role models can change our lives.

That's why it's important to have a successful black president.

It's important tohave a woman astronaut because for every win, thousands mawr are.

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They're short and they're meaningful.

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