This TED Talk features scientist, inventor, and entrepreneur, Rosalind Picard, recorded live at TEDx Mile High 2018.

This talk is highly visual. Watch it now on TED.com.

This is Henry, a cute boy. And when Henry was three, his mom found him having some febrile seizures.

Feebrile seizures are seizures that occur when you also have a fever.

And the doctor said, don't worry too much, Kids usually outgrow these. When he was four,

he had a convulsive seizure, the kind that you lose consciousness and shake, generalized tonic

chronic seizure. And while the diagnosis of epilepsy was in the mail,

Henry's mom went to get him out of bed one morning,

and as she went in his room,

she found his cold, lifeless body.

Henry died of Sudap, sudden unexpected death in epilepsy.

I'm curious how many of you have heard of Sudup.

This is a very well-educated audience, and I see only a few hands.

Sudup is when a otherwise healthy person with epilepsy dies,

and they can't attribute it to anything they can find in an autopsy.

There is a suit up every seven to nine minutes.

That's on average two per TED talk.

Now, a normal brain has electrical activity.

You can see some of the electrical waves coming out of this picture of a brain here,

and these should look like typical electrical activity

that an EEG could read on the surface.

When you have a seizure,

...