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>> GRUNSFELD: The Hubble is our
premier observatory orbiting the

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Earth, unraveling the mysteries
of the universe. We did five

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missions to upgrade and service
the telescope. Hello I'm John

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Grunsfeld, NASA astronaut, you
might wonder, 'How did we learn

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to do the complex tasks using
all the cool tools that we used

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on the Hubble Space Telescope?'

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One of the things that makes
humans unique,

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and certainly one
of the things that makes it a

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lot of fun to work on spacewalks
is developing tools. There are

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other animals that use tools,
but nobody in the animal kingdom

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ever came up with anything like
this!

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