I'm Shankar Vedantam, the host of a podcast called My Unsung Hero.

Each week we share a short story about an act of kindness that changed someone's life.

She cared enough to say something to me, something that probably wasn't easy to say, but

it was something that changed the direction of my life.

So thank you, Holly.

My Unsung Hero.

Listen and renew your faith in humanity.

Hello, smarty listeners.

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Alright, welcome back everybody to every body's got talent.

Before the break we met the femur, also known as the thigh bone.

It's the longest and strongest bone in the human body, but will that be enough to win

your vote?

Time to meet our next act.

From the biggest bone in the human body to the absolute smallest, these bones are so tiny,

altogether they're no bigger than a pencil eraser.

Coming to us all the way from the middle ear, give it up for the obstacle.

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