My design, as it takes you down the rabbit hole, is fraught with many challenges and difficulties in the real world.

by the night and what it is fraught with,

So this is a rather fraught situation.

Ending civil wars is a process that is fraught with dangers, frustrations and setbacks.

There's nothing wrong with big, crazy challenges.

There are challenges. There are challenges.

I was obsessed with Houdini and his underwater challenges.

So with these challenges, what do we do about them?

And here we are, with our challenges and our doubts.

Improvement is increasingly difficult to organize our faith in these systems, incredibly fraught.

We faced many challenges.

I like challenges, yes.

It challenges the norms.

With a lot of hard work and despite many challenges, and even with some chance,

It cannot begin to cope with the challenges that this will bring.

We've had to overcome challenges

Our challenges can be met.

We're facing very tough challenges.

Are there hidden engineering challenges?

And it's full of challenges.

But I will always be honest with you about the challenges we face.

What could these current challenges be?

Now, China dramatically demonstrates both the potential and the challenges of working with rules.

The societal challenges that come along with that kind of inequality deserve some attention.

So we talked about all sorts of behavioral challenges having to do with savings eventually.

And even as there will be huge challenges to come with a transition to democracy,

Yet we're still dealing with a lot of the same challenges as many decades ago.

As it grew, users faced new challenges.

They go places, do challenges, earn points.

What are some of these structural challenges?

Aware of the devastation and the challenges,

I've talked about some of the challenges,

I think such challenges are very interesting.

So there are challenges to be met.

One more before we flip the challenges into solutions, having to do with monkeys and apples.

It's just very, very tiny, and there's lots of biophysical challenges with trying to compute information with tiny, tiny neurons.

The challenges ahead of us are very real.

We have significant challenges in front of us.

And what are the main difficulties and challenges?

So I've mentioned to you the four challenges.

So what would some of the specific challenges

At every site there will be huge challenges.

And at the heart of our challenges (Applause)

These challenges are not insurmountable, by any means.

So we've chatted about a couple of behavioral challenges.