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Wouldn't it be great if we could be
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invisible?
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Ha, right?
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I mean, we could spy on people
without being noticed
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and do whatever we want
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without being held responsible.
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Now, magicians have figured out
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how to utilize full-sized
mirrors to bend light
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in order to create disappearing illusions.
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Scientists have created metamaterials
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to guide rays of light
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around tiny, two-dimensional objects.
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Cameras can also film what is behind you
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and project the image
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so you appear invisible from the front.
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However, none of these options
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can make an object as large as a person
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appear invisible
for all angles and distances
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while its moving.
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But if you are truly invisible,
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as in from within,
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here are a few problems
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you may not have thought about before.
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To move around undetected by other people,
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you would have to be totally naked.
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Even if it's freezing outside!
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You can't carry anything,
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including your wallet and keys,
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otherwise people would just see
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your wallet and keys floating around.
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Drivers and people on the street
can't see you either,
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therefore they can and will run
into you at some point.
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Oh, and you better not wear any perfume
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or make any noise breathing,
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otherwise they'll know you're there.
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And, just because you start off invisible,
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doesn't mean you'll stay that way.
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What if someone accidentally spills
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scolding hot coffee on you?
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And what if it rains?
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But if you think only liquid
can make you visible,
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you're wrong.
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Dust consists of dead
skin cells from humans,
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soil particles,
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and fibers from clothes made from cotton
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and other materials.
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Dust sticks to the moisture
on our skin when we sweat
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and the tiny hairs
on our skin when we are dry.
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So, even if you are invisible,
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dust would still land
on every part of you.
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We usually don't notice
the dust on our skin
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because we can't see a thin layer of dust
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on top of our skin color.
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But, if you're invisible,
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people would see
a human-shaped blob of dust
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walking around with extremely dirty soles.
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Gross!
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What do you think the world looks like
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if you are invisible?
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Well, the answer is nothing.
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The reason you can't see in the dark
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is because there is no light.
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To see an apple,
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light has to hit the apple
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and return it to your eyes.
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Then, the retinas in your eyes
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catch the light reflection for your brain
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to interpret into the image of an apple.
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If you're invisible,
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then, by definition, light would travel
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through you or around you
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instead of bouncing off you
for people to see.
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But that means that retinas in your eyes
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are not catching the light, either.
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Therefore, your brain has nothing
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to interpret into an image.
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Can you see your reflection
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without a mirror to stop the light?
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No.
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So, when you can't be seen by others,
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you also cannot see.
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Ouch!
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Now, have you given any thought
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as of whether the invisibility
is permanent?
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If it is, how can you
receive medical treatment
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from a doctor if you're injured?
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The doctor wouldn't know
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where to apply ointments or bandages
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because they cannot access your injury.
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For that matter, you can't see it either.
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I mean, what if you have
an illness or an infection?
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How can the doctor diagnose you
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without being able to see
the color change or inflammation?
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And what if everyone
is permanently invisible?
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Well, think about how boring
the world would be
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without seeing people on the streets,
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on TV,
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or at home on your computer
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like right now.
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It's lonely being invisible.
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Now, which superpower physics lesson
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will you explore next?
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Shifting body size and content,
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super speed,
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flight,
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super strength,
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immortality,
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and
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invisibility.
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