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MAN: I'm on the International Space Station.
And I'm going to show you a little demonstration with water
and how the meniscus of water
can form both spherical and meniscus lenses.
To make these meniscus lenses,
you need to start out with a sphere of water,
and you can use that as the lens,
but it's kind of hard just to make a sphere by itself.
So what I'm gonna do, I've got a little wire frame here,
and I'm gonna slide this bag over the wire frame.
So, there the bag is on the wire frame.
And I'm going to pull the bag off of the wire frame.
And look what I have.
I'm left on the wire frame a not quite a sphere of water,
and it's stuck to the frame.
And it's really hard to have a free sphere of water
and keep it in front of the camera,
and since this sphere of water is now stuck on the wire frame,
it won't float around and stick on a wall and make a mess.
So, now here -- Here we have this -- this sphere.
It's not really a full sphere, so I'm gonna plump it up.
And here I've got a syringe with a little Teflon needle on it,
and I'm going to kind of plump this water up
to make it into something close to a sphere.
And wouldn't you say this is close to a sphere?
It is what you might refer to as a double-convexed lens
'cause it -- it's got two spherical surfaces,
and both spherical surfaces have optical power
and can be used as a lens.
And now -- Oh, look at that.
Am I upside down or backwards?
MAN #2: Absolutely upside down.
MAN #1: Okay, now I'm gonna keep
getting closer and closer and closer.
And let me know what happens.
MAN #2: Oh, you're getting a very big nose.
MAN #1: I've got a very big nose.
Oh, my goodness.
So, what we have here is the ISS ship's log.
All ship vessels have a log.
And space station,
because it's a ship that happens to be in space,
we have our ship's log.
And we're just using this now as an example
of sticking something that has print in front of it,
in front of this lens.