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I am part of the master plan
Every woman, every man
I've seen them come and go
Go with the flow
I have seen that we all are one
I know all and everyone
I was here when the sun was born
Ages ago
In my mind
I have tried
Catching light
In my mind I left the world behind
Every time I close my eyes
All of nature's open wide
I can hear her
talk to me at night
In my mind I have been trying
Catching light outside of time
I collect it in a box
Collect it in a box
Every time I close my eyes
All of nature's open wide
I can hear her
talk to me at night
I am part of the master plan
Every woman, every man
I've seen them come and go
Go with the flow
I have seen that we all are one
I know all and everyone
I was here when the sun was born
Ages ago
The scientific method itself
would not have led anywhere
it would not even have been formed
without a passionate striving
for a clear understanding.
Perfections of means
and confusion of goals
seem, in my opinion,
to characterize our age.
I am part of the master plan
Every woman, every man
I've seen them come and go
Go with the flow
I have seen that we all are one
I know all and everyone
I was here when the sun was born
Ages ago
I am part of the master plan
Every woman, every man
I have seen them come and go
Go with the flow
I have seen that we all are one
I know all and everyone
I was here when the sun was born
Ages ago.
"Gedankenexperiment" - thought experiment
that's how Einstein called it.
He used his imagination to try to understand
what happens in extreme situations
that real experiments couldn't reach.
Like, for example,
what happens if you would try to catch light.
The speed of light is constant.
I'm sure you've all heard this.
But what does it really mean?
If I go jogging with a friend and I fall behind
I can pick up pace and eventually I will catch up again.
But not so with light.
No matter how fast you run, light still moves away from you
with the speed of light.
How can this possibly be?
That's what Einstein tried to understand.
He discovered that if you try to catch up with light
but light still moves away from you with the speed of light
then time has to slow down.
The light oscillates less often and its color is shifted to the red.
The faster you move, the more it is shifted to the red,
but still you will never catch up with it.
So you can't catch up with light that moves away from you,
but what with light that comes at you?
Can you catch it in a box?
You have probably noticed that if you place a box in the sun
it will not pool light inside.
Instead, the box will get warm.
That's because the material that the box is made of
likes to interact with light and it converts it into
light of other frequencies.
But if you had a perfectly reflective material
could you catch light in the box?
You could try to do this.
But the average mirror, like the one that you have in your bathroom,
only reflects about 90% of the light that falls onto it.
It's made of glass covered with aluminium.
After 20 or so reflections the image gets faint and greenish.
That's because the glass isn't entirely transparent
and aluminium is not a perfect reflector.
The most perfect mirror in existence is the one developed
by the group of Serge Haroche.
It's made of copper covered with superconducting niobium.
When cooled to a temperature of less than one degree
above absolute zero it bounces back and forth photons in the infrared
more than ten billion times.
The two mirrors are about three centimeters apart
and this means they catch light for about half of a second.
But then it will escape.
Nothing real is ever perfect and there are no perfect mirrors.
You cannot catch light in reality, but only in your imagination.