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[SQUEAKING]

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[RUSTLING]

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[CLICKING]

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JEFFREY GROSSMAN: Now,
why does this matter?

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I've got two Why
This Matters today.

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My first one is on a personal
scale, smaller scale.

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And then my next one
is on a grid scale.

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So this is called
the little sun.

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There's over a billion people
who can't read at night,

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because there's no
access to electricity.

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And of course, a lot of the
studying that you could do

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would be at night, right?

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So this is a really
cool program.

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Why does this work?

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This is solar cell.

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But this wouldn't
work, unless you could

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store the electricity, right?

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So I wanted to make you guys
aware of the little sun.

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I'll pass it around.

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You just press this, and you
can read at night, right?

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This is already making
a big difference

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in millions of people's lives.

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That doesn't happen,
unless you've

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got electrochemical
energy storage, right?

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And there's some stats up here.

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25 billion liters
of kerosene are

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used to meet the basic lighting
needs in a lot of these places.

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That releases tremendous
amounts of toxic fumes.

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And you can make a huge
difference, but you can't--

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the same as cooking, right?

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So wood fire cooking
is a huge problem.

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So the challenge is--
but you don't cook.

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If you have a solar
cooker, that's

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great, except that most people
don't cook during the day.

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They cook at night or
in the morning, right?

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And so you've got
to store energy

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to make these things
actually useful, right?

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And I really like this program.

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So I wanted to make that
one of my Why This Matters.

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And we'll go big
on the next one.