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So robots.

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Robots can be programmed
to do the same task millions of times

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with minimal error, something
very difficult for us, right?

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And it can be very impressive
to watch them at work.

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Look at them.

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I could watch them for hours.

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No?

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But what is less impressive
that if you take this robot

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out of the factories

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where the environments are not
perfectly known and measured like here,

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to do even a simple task
which doesn't require much precision,

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and this is what can happen.

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I mean, opening a door,
you don't require much precision.

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(Laughter)

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Or, a small error in the measurements,

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you miss the ?? and that's it

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(Laughter)

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with no way of recovering
most of the time.

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So why is that?

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Well, for many years,

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robots have been designed
to emphasize speed and precision,

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and this translates
in a very specific architecture.

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If we take a robot term,

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it's a very well-defined
set of rigid links

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and mortars who are called actuators,

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they move the links above the joins.

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In this ?? structure,

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you have to perfectly
measure your environment,

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so what is around,

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and you have to perfectly
program every movement

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of the robot joints,

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because a small error
can generate a very large fault,

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so you can damage something
or you can get your robot damaged

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if something is harder.

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So let's talk about them a moment,

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and don't think about
the brains of these robots

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or how carefully we program them,

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but rather look at their bodies.

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There is obviously
something wrong with it,

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because what makes a robot
precise and strong

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also makes them ridiculously dangerous
and ineffective in the real world,

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because their body cannot deform

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or better adjust to the interaction
with the real world.

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So think about the opposite approach,

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being softer than
anything else around you.

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Well, maybe you think that you're not
really able to do anything if you're soft,

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probably.

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Well, nature teaches us the opposite.

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For example, at the bottom of the ocean
under thousands of pounds

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of ?? pressure,

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a completely soft animal

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can move and interact with a much
stiffer object than him.

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He works by carrying around
this coconut shell

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thanks to the flexibility
of his tentacles,

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which serve as both his feet and hands.

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And apparently, an octopus
can also open a jar.

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It's pretty impressive, right?

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But clearly, this is not enabled
just by the brain of this animal,

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but also by his body,

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and it's a clear example,
maybe the clearest example,

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of embodied intelligence,

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which is a kind of intelligence
that all living organisms have.

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We all have that.

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Our body, its shape,
material and structure,

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plays a fundamental role
during a physical task,

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because we can conform
to our environment

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so we can succeed in a large
variety of situations

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without much planning
or calculations ahead.

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So why don't we put
some of this embodied intelligence

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into our robotic machines

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to release them from relying
on excessive work

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on computation and sensing?

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Well, to do that we can follow
the strategy of nature,

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because with evolution,
she's done a pretty good job

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in designing machines
for environment interaction,

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and it's easy to notice that nature
uses soft material frequently

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and stiff material sparingly.

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And this is what is done
in this new field or robotics

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which is called soft robotics,

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in which the main objective
is not to make super-precise machines

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because we've already got them,

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but to make robots able to face
unexpected situations in the real world,

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so able to go out there.

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And what makes a robot soft
is first of all his compliant body,

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which is made of materials or structures
that can undergo very large deformations,

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so no more rigid links,

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and secondly to move them
we use what we call distributed actuation,

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so we have to control continuously
the shape of this very deformable body,

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which is the fact of having
a lot of links and joints,

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but we don't have
any stiff structure at all.

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So you can imagine that building
a soft robot is a very different process

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than stiff robotics, where
you have links, gears, screws

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that you must combine
in a very defined way.

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In soft robots, you just build
your actuator from scratch

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most of the time,

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but you shape your flexible material

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to the form that responds
to a certain input.

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For example here, you can just
deform a structure

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doing a fairly complex shape

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if you think about doing the same
with rigid links and joints,

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and here what you use is just one input,

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such as air pressure.

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Okay, but let's see
some cool examples of soft robots.

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Here is a little cute guy
developed by Harvard University,

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and he works thanks to waves
of pressure applied along its body,

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and thanks to the flexibility he can
also sneak under a low bridge,

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keep walking,

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and then keep walking
a little bit different afterwards.

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And it's a very preliminary prototype,

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but they also built a more robust version

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with power on board that can actually
be sent out in the world

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and face real-world interactions

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like a car passing it over it,

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and keep working.

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(Laughter)

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It's cute.

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(Laughter)

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Or a robotic fish which swims
like a real fish does

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in water simply because it has a soft tail
with distributed actuation

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using still air pressure.

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That was from MIT,

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and of course we have a robotic octopus.

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This was actually one of
the first projects developed

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in this new field of soft robots.

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Here you see the artificial tentacle,

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but they actually built and entire machine

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with several tentacles they could
just throw in the water,

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and you see that it can kind of go around
and do submarine exploration

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in a different way
than rigid robots would do.

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But this is very important for delicate
environments such as coral reefs.

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Let's go back to the ground.

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Here you see the view

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from a growing robot developed
by my colleagues in Stanford.

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You see the camera fixed on top.

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And this robot is particular
because using air pressure

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it grows from the tip
while the rest of the body

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stays in firm contact
with the environment.

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And this is inspired
by plants, not animals,

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which grows via the material
in a similar manner

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so it can face a pretty large
variety of situations.

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But I'm a biomedical engineer,

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and perhaps the application
I like the most

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it's in the medical field,

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and it's very difficult to imagine
a closer interaction with the human body

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than actually going inside the body,

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for example to inform
a minimally invasive procedure.

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And here, robots can be
very helpful with the surgeon

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because they must enter the body

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using small holes
and straight instruments,

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and these instruments must interact
with very delicate structures

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in a very uncertain environment,

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and this must be done safely.

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Also bringing the camera inside the body,

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so bringing the eyes of the surgeon
inside the subject, I feel,

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can be very challenging
if you use a rigid stick,

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like a classic kind of scope.