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Engineers at the
MIT Leg laboratory

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built robots that walk and run.

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The 3D modified uses a
gyroscope to sense balance

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and hops on a springy piston
like leg using compressed air.

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The robot places its foot to
maintain balance and speed

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and can react
appropriately when pushed.

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Some of the robots,
such as the Uniroo,

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are inspired by animals.

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This robot uses its tail to
help it bounce like a kangaroo.

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One thing the engineers
wanted to find out

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was, how fast can
a legged robot run?

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The planar biped currently
holds the world speed record

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for a legged robot.

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Here, it is running
11 miles per hour.

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The planar biped can
also climb stairs.

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Because it doesn't
have any eyes,

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it needs to be told
where the stairs are.

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It can also do some
basic gymnastics.

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The 3D biped can
also do gymnastics.

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All of the running robots
use springs in their legs

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just like animals do.

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Kangaroos, horses,
and even people

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have tendons, which
store and release

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energy like a bouncing ball.

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Since the Quadruped
has four legs,

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it can run with different gaits.

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Here, it is trotting
like a horse.

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And here, the robot is
bounding like a rabbit.

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Like the other
robots, the Quadruped

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gets its power through
hydraulic, pneumatic, or

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electrical cables.

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Spring Flamingo is
a two-legged robot

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that walks almost
as fast as a person.

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Instead of bouncing on springy
legs, like running robots,

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walking robots bob up and
down like a football rolling

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end over end.

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Since Spring Flamingo
doesn't have eyes,

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he senses hills using his
feet in response to it

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like you would if
your eyes were closed.

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Reconfigurable Blob
robots can have

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advantages of both
wheeled and legged robots.

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They can both get over rough
ground like a tank tread

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or roll efficiently
like a wheel.

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Using what was learned
from legged robots,

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the engineers also construct
intelligent artificial limbs

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like this prosthetic knee.

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They are trying to make
the knee think and react

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for different conditions.

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Computer simulations are used
to test the robot programs

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and also as an animation tool.

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[MUSIC PLAYING]

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