The famously difficult green-eyed logic puzzle - Alex Gendler

View full lesson: http://ed.ted.com/lessons/the-famously-difficult-green-eyed-logic-puzzle-alex-gendler

One hundred green-eyed logicians have been imprisoned on an island by a mad dictator. Their only hope for freedom lies in the answer to one famously difficult logic puzzle. Can you solve it? Alex Gendler walks us through this green-eyed riddle.

Lesson by Alex Gendler, animation by Artrake Studio.

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Автор Meppers JR ( назад)
I still don't understand what he's saying

Автор xXeditzXx ( назад)
Break the bottle and just said it dropped........

Автор Solcoolman ( назад)
I would've said: "Get logic idiots."

Автор mutate 9601 ( назад)
You said they can't communicate and on 2:38 you said they tells each other

Автор David Spring ( назад)
I would have said "you all have green eyes" because that's not new information, they just couldn't communicate it.

Автор Pandora the Male Leopard ( назад)
you outsmarted the dictator by saying one of you has green eyes so the prisoners asked if they could leave to see which one had the green eyes

Автор Kitten Jibanyan ( назад)
No I can't solve this riddle
There is no logic

Автор The gamer Bro ( назад)
They could have all looked in each other's eyes carefully and found out

Автор Martín Gonzalez ( назад)
Hahahahahaha that's really clever

Автор Zhao Xian Ng ( назад)
Pour water on the floor that's reflective madafuka

Автор Rainbow Clouds12 ( назад)
" as it is, all 100prisoners have green eyes" talk about racism to the max, LOL

Автор lucky girl ( назад)


Автор PRGME7 ( назад)
Why would the dictator teach colors to the prisoners

Автор Carlos Rios ( назад)
I'd say "Each of you find one different person with green eyes and stare at them." Then there would be 50 pairs of people staring at one another, each one realizing they're being stared at because they have green eyes. Off the island in a couple minutes.

Автор Ragesh G.R ( назад)
everyone knows that atleast 99 have green eyes. so all could have left the 100th day after they became sentient enough to understand logic. the announcement was not at all required

Автор janghoon lee ( назад)
Then there's the guy that's color blind. Feels bad man

Автор Ms Cristina's Shop ( назад)
One green eye! Seriously! I would see 99! So its a lie!!!!!!!!!!!!!!!!!!!!!!

Автор Ella G ( назад)
Unless you have brown eyes and nobody kept track of that for 98 days.

Автор 92axelmaster ( назад)
Or you could call in SEAL team six and liberate the island.

Автор Kimmy Jo ( назад)
point to the grass, point to your eyes and and wait for a nod...seems simple enough

Автор Tenor Ong ( назад)
Didn't they alr know at least 1 have green eyes they see 99 people with green eyes every morning

Автор nathan cao ( назад)
but what if they're all to dumb too know that

Автор meow 3756 ( назад)
How can you be a logition as a prisoner on a deserted island

Автор . ( назад)
When the video started I thought he was talking about Cuba.

Автор Christopher Bacha ( назад)
everybody watching in 2017 like this comment

Автор Jareth Klaassen ( назад)
the mad dictator has no weapons, as they could be too shiny. therefore, all you need to defend yourself from the dictator is skill and a sword. which means, you could say "at least 99 of you have green eyes" without dieing.

Автор 49ducks Gaming ( назад)
now listen up this is confusing,you tell them they all have green eyes now this is new information, to some because technically it works.

Автор Apotre Mosko ( назад)
didn't get this one..

Автор much As you want ( назад)
I would just take my chances, and just asked to leave from the beginning

Автор Michael Le ( назад)
i would have said i like your eyes that would have helped them know if they have green eyes or not

Автор Mary Rachel ( назад)
There is a 100% chance that I have green eyes, because I don't live in such a cruel and bias prison.

Автор Dylan Memes ( назад)
This is probably the easiest riddle they have put out

The dictator is trump

Автор Megan Amato ( назад)
Why can't they say everyone around you has green eyes?

Автор coblestoneBoom ( назад)
Adria and Bill. I ship it.

Автор Izzy Haddad ( назад)
God I love ASL (American Sign Language)

Автор Spark Animations ( назад)
can I just use hand motion

Автор Creepy Betty ( назад)
If they are on the island, they could just look in the ocean

Автор Evo- Un ( назад)
Nobody told them that they could leave if they had green eyes

Автор Maverick Wang ( назад)
Just look at other people eyes.That is a reflective surface

Автор Twisted Code ( назад)
I stopped understanding when you added the 3rd person. Could someone ELI5? I'm normally decent with logic puzzles, but this puzzle has me puzzled more than most puzzles puzzle me.

Автор Rob Wilks ( назад)
Could have said, every prisoner u see has green eyes👌

Автор Eumir Homeres ( назад)
what if u just siad "All of u have green eyes"???

Автор Holly does......... ( назад)
Why don't they just communicate with sign language?

Автор CrestedAmy ( назад)
the prisoners could have pointed to the anything green and then point at the other person till they understand.

🌳➡👧👦👧👦➡eyes arrow=the person pointing

Автор Steve jenkins ( назад)

Автор Steve jenkins ( назад)
Couldn't one of the priosners just grab a leaf, point to another prisoners eyes

Автор Vortex Of Rainbows ( назад)
What if you look into someone else's eyes, then you can see a reflection (Kappa)

Автор RedX_16 ( назад)
wait if they didn't talk since birth then that means they don't know how to talk... so they dont know how to understand other people! simple logic

Автор :v ( назад)
I have green eyes

Автор :v ( назад)
I have green eyes

Автор Jack Hacker ( назад)
i know the answer, viva la revolution!!!!!

Автор Loc Thomson ( назад)
If i was on the island, I would have thought if everyone else had green eyes, I wouldn't be an exception. Then I would get shot for trying to break out anyway.

Автор UnicornBlingThing ( назад)
Only green green eyes can leave? ONLY GREEN EYES?

*That's rasist.*

Автор PRNTSCRN ( назад)
I think they can go home even the first day ;)
If you would tell them: The person / persons next to you has /have green eyes? (This is not information they don't know, and they can immediately reflect it to themselves).
Because this is true for everyone.

Автор Pineapple Kyle ( назад)
Knowing dat I could have a green eye 1/100 chances is enough for me to yolo ask the guard xD

Автор Astralflight Warriors ( назад)
So, I don't see why they couldn't dump water into their hand in order to see their eyes. They were clearly drinking out of it so water could obviously come out.

Автор Owen Bartels ( назад)
If they can't speak then how do they ask to leave?

Автор CaptainROFL ( назад)
couldn't you say something like, 'poke everyone you see with green eyes' and then everyone would get poked, and leave the island over night

Автор RoseQuartzPanda ( назад)
But... But what if they don't know that they're all perfect logicians?

Автор NotsoEthos ( назад)
but would they know what green is?

Автор Twin Blade Volt ( назад)
Wouldn't it be weird if literally EVERYONE had green eyes. Like if I saw everyone had green eyes I'd assume I'd have green eyes and leave.

Автор The Wot Blitz Gamer ( назад)
You can look into someones pupil and you reflexion is there and then they know if they are green eyed

Автор XxHatterxX ( назад)

Автор Tilda Larsson ( назад)
Stop spoiling everything before I have paused

Автор _Shattered_ ( назад)
that complicated explanation was unnecessary because if they are smart they will solve it without your statement btw thats not new info, you can just push someone to the exit (probably your friend because they trust you) boom that easy and the last person is next to the second last because they are arms on shoulders pushing each other

Автор _Shattered_ ( назад)
i would have said for everyone to get in a line besides one person give the people with green eyes a 1 and within 1 night everyone is gone because the person not in line can point at them selves and gesture for there eye color by pointing at their eye

Автор Pieces297 ( назад)
What's with the hitler moushstache

Автор SimplyGaming24 ( назад)
Or... you could just pour some water on the floor and look into it, cuz water is reflective...

Автор Roann Houngue ( назад)
Or you could tell them that there is an even number of people with green eyes, they would then realize that if they see 99 people with green eyes, the 100th person (themselves) should have green eyes as well

Автор Owen Bartels ( назад)
Wait in the beginning he said: IMAGINE an island. So that mean imagine all the prisoners are idiot and really want to get off the island

Автор QuaticL ( назад)
They are on an island. Isn't water reflective?

Автор Dragonoidalpha ( назад)
The prisoners could have looked at their reflection in the water XD

Автор coblestoneBoom ( назад)
If I had just said that "at least 99 of you have green eyes", because that is not giving them new information. They see the other 99 people on a daily basis, and they would know that all 99 of them have green eyes. Everyone would've been gone within two days, because once they see that no one else has gone, they would know that they also have green eyes, because everyone was thinking the same thing.

Автор ArceusPower101 ( назад)
did you know that less than 2% of people actually has green eyes?

Автор Emily Davis ( назад)
Or what if you said 'You can leave the island'.  They already know the possibility of them leaving but this confirms it.

Автор Rickity Sticks ( назад)
Spill the water? No? Eh try the hard way.

Автор Lily cat ( назад)
I would say: Spill water on the ground and look at it.)

Автор Alex Wheeler ( назад)
wouldn't another solution just be, "everyone around you has green eyes" since it is said to all of them at the same time, that must mean that the statement applies equally to everyone. therefore, everyone must know that they have green eyes.

Автор Pancakeman1234 ( назад)
couldn't you just say that "everyone you see has green eyes"?

Автор Mr.goose Goosersom ( назад)
the statement "at least one if you has green eyes" suggests that the number of people with green eyes must be greater than or equal to 1. Considering that everyone can see each other, they can conclude that if everyone have green eyes, I must have green eyes.

Автор Aryan Saini ( назад)
1:18 use a giant run on sentence

Автор Owen Bartels ( назад)
Just say "The person to your left and right as green eyes" it's not new information

Автор Warrior Army ( назад)
I got the second way so I'm the best

Автор truthless47 ( назад)
The funny part about this one is that it assumes a high level of intelligence of the people you're trapped with. Personally, I would assume none of the other 99 could make logical deductions like that, and never leave.

Автор randomyoshie ( назад)
Couldn't you have said the people next to you have green eyes

Автор The Pokemasters ( назад)
You could also say "the person beside you has green eyes"

Автор Tony Scimeca ( назад)
This one kinda sucked.

Автор Astra CS:GO ( назад)
It really should be easy, just look at everyone so you see that they have green eyes. Then what is the chance of you not having green eyes too?

Spoiler: Small

Автор lord bacon ( назад)
couldn't they just see their reflechtion in other people's eyes ????????

Автор Discord Is Best Princess ( назад)
You can see your reflection in other people's eyes... also you can pour the water on the floor

Автор irura nganga nyiha ( назад)
Why can't you say...
Look at your partner and nod to me if they have green eyes
Assuming there are an even number of aliens, everybody would nod, thus proving that they all have green eyes
Also, they are not technically communicating with each other but with me, since I told them to nod at me.

Автор I_am_boosted ( назад)
High five some one if you have green eyes

Автор Norcalflat ( назад)
"Attention North Koreans, at least one of you have green eyes."

Автор Jade Choy ( назад)
Would" if anyone you see has green eyes, give them a pinch." Work?

Автор Get / Here ( назад)
You don't know who's watching who though?

Автор OnEpIeCeLuFfY9 ( назад)
What is fun is the dictator, any other sentences i found, fiven the ´´danger´´ that the dictator represents for me is not valid. But I only spent 3 mins thinking, anyone tought another way? I tough a few like: only 1 person in this island doesn´t have green eyes or there´s at least 1 green eyes person front, back or by your side...

Автор Zoë Zaki ( назад)
Okay? It works with three people but it doesn't work with 4 people. This is dumb.

Автор Ittikii OwO ( назад)
What if you said, "Everyone you see has green eyes."

Автор TrollandNoob ( назад)
They can look into each other's eyes

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