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Some superheros can move faster than the wind.

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The men in Apollo 10 reached

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a record-breaking speed of around 25,000 miles per hour

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when the shuttle re-entered the Earth's atmosphere in 1969.

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Wouldn't we save a lot of time

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to be able to move that fast?

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But, what's the catch?

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Air is not empty.

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Elements like oxygen and nitrogen,

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even countless dust particles,

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make up the air around us.

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When we move past these things in the air,

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we're rubbing against them

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and creating a lot of friction,

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which results in heat.

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Just like rubbing your hands together warms them up

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or rubbing two sticks together makes fire,

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the faster objects rub together,

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the more heat is generated.

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So, if we're running at 25,000 miles per hour,

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the heat from friction would burn our faces off.

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Even if we somehow withstood the heat,

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the sand and dirt in the air

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would still scrape us up

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with millions of tiny cuts

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all happening at the same time.

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Even seen the front bumper or grill of a truck?

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What do you think all the birds and bugs would do

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to your open eyes or exposed skin?

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OK, so you'll wear a mask

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to avoid destroying your face.

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What about people in buildings

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between you and your destination?

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It takes us approximately one-fifth of a second

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to react to what we see.

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By the time we see what is ahead of us

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and react to it -

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time times velocity equals distance

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equals one-fifth of a second times 25,000

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equals 1.4 miles

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- we would have gone past it

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or through it by over a mile.

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We're either going to kill ourselves

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by crashing into the nearest wall in super speed,

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or worse, if we're indestructible,

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we've essentially turned our bodies into missiles

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that destroy everything in our path.

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So, long distance travel at 25,000 miles per hour

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would leave us burning up,

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covered in bugs,

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and leaves no time to react.