He is an adept climber.

This climber was snow blind.

He is a fine type of mountain climber.

The climber stayed alert while climbing the precipice.

This climber is on the last pitch of it.

They tried to radio a message to Rob Hall, who was a superb climber stuck, sort of, with a weak climber up near the summit.

Here's our blindfolded hill climber, and he's climbing this rounded hill.

Or do you see a mountain climber reaching for the top?

Now, he's a rock climber, but you know, he's our executive director.

Lynn Verinsky, a professional climber, who appeared to be brimming with confidence.

You can see on this climber, we have two oxygen tanks in the backpack

If we were the hill climber, it would be right here where he starts off.

And one more climber should have died that day, but didn't, and that's Beck Weathers.

To help me answer this question, I'm going to get the help of my blindfolded hill climber.

B is going to be his next position so this is how the hill climber decides where to go next.

We also got some bad news in the storm that Beck Weathers, another climber, had collapsed in the snow and was dead.

The way we're going to do that is by using the gradient, and when we do that, our climber is going to get to the top of the hill.

And a professor in the University of Massachusetts, in the zoology department, bought this climber because she wanted to study the insect diversity of the top of the tree canopy.

If I was over here and taking the gradient, I would still be pointing uphill, but the vector wouldn't be quite as long now because now we're up here, and the slope isn't so great, and with reduced slope comes reduced gradient and a reduced step size for our blindfolded hill climber.