分类目录归档：light
Code is the next universal language.
In the seventies, it was punk music that drove the whole generation.
In the eighties, it was probably money.
But for my generation of people,
software is the inter
People don't realize
that red light and benign near-infrared light
go right through your hand, just like this.
This fact could enable better, faster and cheaper health care.
Our translucence is key he
so let's talk for a few minutes about
ultraviolet light so ultraviolet light
or UV light is a type of light that's
actually pretty similar to the visible
light but it actually has different
wavelength
[Music]
[Music]
as a particle physicist I study the
elementary particles and how they
interact on the most fundamental level
for most of my research career I've been
using accelerators such as the ele
Translator: Andrea McDonough Reviewer: Bedirhan Cinar
You look down and see a yellow pencil lying on your desk.
Your eyes, and then your brain, are collecting
all sorts of information about the pencil
What if you could only see one color?
Imagine, for instance,
that you could only see things that were red
and that everything else
was completely invisible to you.
As it turns out,
that's how you live
Penguins have long captured
the imagination and the hearts
of people the world over.
But while popular culture
depicts them as clumsy, adorable birds
with endlessly abundant populations,
the truth is
Light is the fastest thing we know.
It's so fast that we measure enormous distances
by how long it takes for light to travel them.
In one year, light travels about 6,000,000,000,000 miles,
a distance
Watch the center of this disk.
You are getting sleepy.
No, just kidding.
I'm not going to hypnotize you.
But are you starting to see colors in the rings?
If so, your eyes are playing tricks on you.
You may know that it takes light a zippy eight minutes
to reach us from the surface of the Sun,
so how long do you think it takes light
to travel from the Sun's core to its surface?
A few seconds or a