Why Are Cicadas So Good At Math?
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Do periodical cicadas "know" how to calculate prime numbers? One of the strangest life cycles in all of biology, explained!
Special thanks to Samuel Orr (www.motionkicker.com) for the beautiful cicada footage!
Learn more about magicicadas at www.magicicada.org/
Have an idea for an episode or an amazing science question you want answered? Leave a comment or check us out at the links below!
Our website: www.itsokaytobesmart.com
Follow on Instagram: / drjoehanson / okaytbesmart
-----------------
It's Okay To Be Smart is written and hosted by Joe Hanson, Ph.D
Email me: itsokaytobesmart AT gmail DOT com
Facebook: / itsokaytobesmart
For more awesome science, check out: www.itsokaytobesmart.com
Produced by PBS Digital Studios: / pbsdigitalstudios
Joe Hanson - Creator/Host/Writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen IncKate Eads - Producer
Andrew Matthews - Editing/Motion Graphics/Animation
Katie Graham - Camera
John Knudsen - Gaffer
Theme music: "Ouroboros" by Kevin MacLeod
Other music via APM
Stock images from Shutterstock, stock footage from Videoblocks
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@msbluelovespurple 6 жыл бұрын
If cicadas can sleep for 17 years and wake up only to scream than I can do it too damn it.
@LoliKami 5 жыл бұрын
It’s more like, feeding on someone else’s misery for 17 years
@gamedifficulty190 4 жыл бұрын
they ain't special
@RenzohsClub 4 жыл бұрын
msbluelovespurple then*
@clarahowson2911 4 жыл бұрын
+
@nathaniel907 4 жыл бұрын
use thenn
@farenhite4329 7 жыл бұрын
That explains my math teacher
@bibasik7 6 жыл бұрын
Underrated comment.
@saeedalhomsi5887 5 жыл бұрын
Yeah
@LetMeEatIt 4 жыл бұрын
Who is your teacher?
@secretgreen2065 4 жыл бұрын
@@LetMeEatIt a cicada, duh
@NafeeDoesStuff 4 жыл бұрын
My math teacher literally looks at a math and writes the answer within a minute
@TheOswald42 8 жыл бұрын
so if they hide underground for years, how long is their lifespan...?
@whackuum2144 6 жыл бұрын
They die few weeks after emerging.
@seiyuokamihimura5082 6 жыл бұрын
Too long.
@black-op345gaming5 6 жыл бұрын
Depending on the species, their life cycle is anywhere between 2-17 (most species last 2-5) years. Most of their time is spent as nymphs underground And yes I got this from a Wikipedia article
@governmentofshreksswamp6383 5 жыл бұрын
Infinity Only joking
@alexthewolfia7452 5 жыл бұрын
About 17 years and 2 weeks
@ferdinand8931 8 жыл бұрын
I'm watching this in the bathroom. You got me. I feel violated
@dragoncraftgaming1041 7 жыл бұрын
TheEpicCheese same
@MoeJae86 7 жыл бұрын
Ferdinand ikr big brother is a peeping tom! XD
@ghoulfei 6 жыл бұрын
Ferdinand So am I XD
@calumgibson8773 6 жыл бұрын
Ferdinand samelol
@robertoarmstrong7317 6 жыл бұрын
Poop yeah!
@youvanthao8440 8 жыл бұрын
that moment when u realize that an insect is older than you....BRUH
@veilofthevale974 8 жыл бұрын
HUAAAA
@grantmacdonald3904 8 жыл бұрын
CHIRP CHIRP CHIRP CHIRP
@taxavoider9889 8 жыл бұрын
Now I feel bad about myself, thanks
@GhengisJohn 7 жыл бұрын
YOU feel bad about yourself? I just realized that I'm old enough to be that cicada's FATHER. Err... wait...
@aaaaa359 7 жыл бұрын
It's called Zoophilia
@OMyStuff 8 жыл бұрын
For all those cicadas I have only one thing to say: May the odds be ever in your favor.
@ash64181 8 жыл бұрын
ha ha hungers games and math, you're a true geek
@kierantheninja3008 7 жыл бұрын
The Narrator, surely your parents are related.
@sabbs_ 7 жыл бұрын
I'm reading the hunger games right now, I just finished catching fire
@ishwarkothandaraman3354 7 жыл бұрын
Sara . . . Prim dies.
@sabbs_ 7 жыл бұрын
Hehehe I finished the last book like a week after I wrote that comment
@joshuahadams 8 жыл бұрын
Your NINCADA is evolving! Your NINCADA evolved into NINJASK! You received a SHEDINJA!
@arielmarroquin2132 8 жыл бұрын
i was thinking about this POKEMON the hole video
@nana-rb1sx 5 жыл бұрын
Whole
@Chopperdragon39 5 жыл бұрын
I love shedinja
@psychedeliconeness363 5 жыл бұрын
@@nana-rb1sx thank you
@RaiComrade 5 жыл бұрын
Shedinja with sturdy (IYKWIM)
@sabr3cat188 8 жыл бұрын
"Hello. We are searching for highly intelligent individuals." No wonder these people love this ingenious insect; it's mathematically superb!
@vaishnavinrao7231 3 жыл бұрын
😂😂
@LuisLopez-lr1lv 9 жыл бұрын
Cicada 3310
@CashKingD 9 жыл бұрын
Luis Lopez What is the answer? We may never know.
@LuisLopez-lr1lv 9 жыл бұрын
CashKingD I agree we shall never know. Maybe cicadas are the ones responsible for the Cicada 3310 puzzles? The world may never know...
@edhk6440 9 жыл бұрын
Luis Lopez 3301 not 3310
@mohdrazif777 9 жыл бұрын
indestructible cicada?
@ZombieChan84 7 жыл бұрын
3301 is also a prime number.....wait what else has 3s in it? Pyramids do.....they only have 3 sides. Illuminati confirmed.
@jkreitlow 9 жыл бұрын
That bathroom quip hit close to home
@UniqueOneShot 9 жыл бұрын
yup
@Moucheron1990 9 жыл бұрын
Deviljho he got me too...
@kendricknorr2342 9 жыл бұрын
John Kreitlow I only wish it weren't true.
@thomaswilson5625 9 жыл бұрын
Same
@VicodinElmo 9 жыл бұрын
Hahaha! "Pretty much so we can watch videos about cicadas in the bathroom". Which is exactly what I was doing in EXACTLY the same way as you showed in the animation (even the slightly angled orientation of the device on my tiles). That was freaky haha.
@EugeneKhutoryansky 9 жыл бұрын
Interesting information. Thanks for the video, and good luck to the cicadas.
@yanglai 9 жыл бұрын
B-but...you're a dog...
@simoputtonen2799 9 жыл бұрын
Love your videos!
@C0d0ps 9 жыл бұрын
Commenting Otaku You wot m8?
@TheCatVtuber 8 жыл бұрын
[Cicadas Noise]
@ihatemyselfsrs3723 7 жыл бұрын
I have 💯 years
@dougthedonkey1805 4 жыл бұрын
“And we’re all really excited about the next Star Wars trilogy” And what a mistake that was
@dougthedonkey1805 3 жыл бұрын
@Hinters you’re free to have an opinion. I disagree completely, and the way I see it, it’s a complete failure in every way besides the visuals. I’m glad you like it though
@dougthedonkey1805 3 жыл бұрын
@Hinters yeah, I think that the biggest reason people like the new trilogy is because there’s some characters they like, some items and planets they like, and admittedly really cool pictures and colors and stuff to go with it. And John Williams is always a spectacular composer, of course. To answer the thing about a fourth sequel, I think that they wouldn’t want to break the mold of Star Wars movies coming in threes. They’re definitely gonna make more standalone content, though
@dougthedonkey1805 3 жыл бұрын
@Hinters ohh, I see. I wouldn’t doubt that like twenty years in the future they’ll make another trilogy. Once all the people who were weaned on this trilogy grow up and start being able to pay for movies themselves, they’ll want to see the fourth trilogy out of nostalgia.
@dougthedonkey1805 3 жыл бұрын
@@zacpizzy I’m not a super big prequels guy, so I do agree that Kylo Ren was better than Anakin in a few ways. I’m not sure which I think is better overall though
@naturespecialist1489 3 жыл бұрын
17 year cicada:" HAHAHAHAHAHAHAHAHAHAHA!!!!!!"
@CyPhi68 8 жыл бұрын
Looks like cicadas are primed to avoid their predators.
@FishSnackems 7 жыл бұрын
_*Why_
@moondust2365 5 жыл бұрын
Buh dum ptum! (drum sound effect thingy)
@XtremeQuantumSrength405 5 жыл бұрын
NIGA WAT
@XtremeQuantumSrength405 5 жыл бұрын
@Ng John also the fact that my 1 m old is cringy
@XtremeQuantumSrength405 5 жыл бұрын
R/boneappletea
@gigglysamentz2021 9 жыл бұрын
2:35 It's about 18 °C if you were wondering. Cuz I was >
@itsohaya4096 3 жыл бұрын
Thanks bro
@SteampunkBard 9 жыл бұрын
I never expected a video about cicadas to become one of my favorite videos ever
@ScienceAsylum 9 жыл бұрын
That is so cool!!! Primes FTW!
@UniqueliAnimationsSN 7 жыл бұрын
I was on the washroom when the guy said "so we could watch youtube videos about cicadas" lmao
@UniverseEarthSpirit 6 жыл бұрын
My favorite insect! I love cicadas.Their place in the natural world is freakin' amazing! AND you mention Steven J. Gould!!! A blast from my educational past in biology! Loved this!
@PabloCorinthian 9 жыл бұрын
What will happen when Joe meets with his clone, Hank Green? Or rather, Hank Green's clone Joe Hanson? Wait.... if Joe is a PhD and Hank is just a Master... does that mean Hank is the clone?! Pls do a video on this conundrum. If Wheezy Waiter is involved, it would be best.
@PabloCorinthian 9 жыл бұрын
PabloCorinthian Oh Crap. Joe is the Doctor. Hank is the Master. Doctor Who exists! Half Life 3 Confirmed!
@nlm2nd 9 жыл бұрын
PabloCorinthian If Joe is the Doctor and Hank is the Master, is Craige the Bachelor? Whose the Associate?
@thomaskn1012 9 жыл бұрын
PabloCorinthian Julian Huguet of DNews
@ShadeSlayer1911 8 жыл бұрын
+PabloCorinthian Hank has a Master? I thought he just has a Bachelor in Chemistry?
@kalpeshthakar1064 7 жыл бұрын
PabloCorinthian I
@neilburns7974 7 жыл бұрын
I'm actually on a toilet watching this on my phone
@alistergoh9744 5 жыл бұрын
I'm watching the toilet while sitting on my phone
@kickpunchgaming9623 4 жыл бұрын
Sml
@atoilet9981 4 жыл бұрын
I am the toilet
@HoneycombTheywontletmeputjusto 4 жыл бұрын
Get up soon or you'll get hemorrhoids
@tristandevos1366 Жыл бұрын
I wish you had a nice poop 🤧🐛
@tragik1626 6 жыл бұрын
2 + 2 is 4, minus 1 that’s 3, quick meths
@zeroomega3781 5 жыл бұрын
everyday man's on the block, smoke trees
@just13rian14 4 жыл бұрын
See your girl in the park, that girl is the uckers
@aggersoul23 3 жыл бұрын
Never thought Id have an answer to such an important question.
@jrjubach 9 жыл бұрын
This was freaking awesome and mind-blowing. Never thought I'd say that about a video about cicadas.
@pravishal5102 7 жыл бұрын
When I first saw the title, I sincerely believed it was going to be about the Cicada 1331, and their maths puzzles!! :D
@connfdm 7 жыл бұрын
3301*
@pravishal5102 7 жыл бұрын
My bad!
@mowu8459 7 жыл бұрын
there should be a horror film/game involving cicadas
@unclefreddieDied 4 жыл бұрын
I'd never go outside!
@br00klynnative58 3 жыл бұрын
@@unclefreddieDied Im not
@fackingpos 9 жыл бұрын
I'm still wondering why in every movie where the protagonist is in a hot desert and the camera pans down from the Sun they use the sound of cicadas to emphasize the Sun beating down on the protagonist
@danielazevedoteixera4194 6 жыл бұрын
fackingpos i think the cicadas are meant to reflect loneliness and silence. Because its all so quiet you can hear their humming from far away
@user-oy6hk1gn7l 5 жыл бұрын
Maybe something about the loud and harsh sound reminds us of a really hot sun?
@firstlast7138 3 жыл бұрын
Because thats how it is in japan
@jose_500 9 жыл бұрын
another great video. prime numbers, periodicity, and evolution all in one; what an elegant example of so many neat things!
@DbladeMedic 6 жыл бұрын
The flying salt shakers of death? That would be the daleks
@adrianaldridge2267 7 жыл бұрын
*shouts out the window at the cicadas screaming outside at 3AM* THAT SHOULD BE ME SCREAMING! ME!
@TheJaseku 9 жыл бұрын
Extreme high quality video : ) Thank you so much!
@rachelb.2803 3 жыл бұрын
Love this video, I can use it as material on my virtual program for differing disabilities adults
@tinylol 7 жыл бұрын
That intro (the Cicada intro) is so epic XD
@Shaggy2286 9 жыл бұрын
... you show 15 groups and yet none are in the western states which do have them. I grew up in northern Nevada and remember when they came out in force... though I also remember more than one summer hearing them, though they were not nearly as numerous. Speaking of insects, we also had mormon crickets. Which have probably given more than one person PTSD from having their house covered by massive swarms.
@besmart 9 жыл бұрын
Shaggy2286 Some species of cicadas come out every year, those are almost certainly the ones you're thinking of. The periodical prime number cicadas are limited to the eastern half of the US, though.
@appaloosahill4499 8 жыл бұрын
The cicadas are out RIGHT NOW for me
@tiffanieharper7354 7 жыл бұрын
I'm lucky I live in the southern part
@bananaboy8416 7 жыл бұрын
He literally said here in the US
@shadmanislam6434 7 жыл бұрын
Shaggy2286 hi like for a nkce day
@BlackFlashDrive 9 жыл бұрын
Great production!
@samsunkandroit8797 3 жыл бұрын
*so interesting, thanks for this Video!*
@TmT012 9 жыл бұрын
When Cicadas fsil their math they cry. And 'when they cry' bad things happen.
@HellsRaven4444 9 жыл бұрын
TmT012 'You'
@felipe.pegado 9 жыл бұрын
Hahahah they only bring curse when they cry.
@Lunictd 9 жыл бұрын
When the cicadas cry is when the life is no more. If you know what I mean...
@second2none914 9 жыл бұрын
The only reason I came here was for a higurashi reference
@null5573 3 жыл бұрын
Oh yeah~! when they cry reference
@computer5272 5 жыл бұрын
The underground scene confirmed that I am part cicada.
@cicadaboi101 3 жыл бұрын
I'm part human
@Tigercam24 5 жыл бұрын
This is high quality content. Thank youuuu!
@thepussygrabbingfamilyvalu557 7 жыл бұрын
fascinating. thanks. that was absolutely fascinating!
@prestonestes1388 7 жыл бұрын
Funny enough. I'm in the bathroom watching this. Lol
@SaikatBasak 7 жыл бұрын
The magic of reality
@ForsakenPixel 3 жыл бұрын
oh my god that explains why i suddenly saw several, and i mean SEVERAL, of those things on 2015 in Nebraska. I would travel to South Dakota every odd year and only on 2015 did i see that many. A freaking carpet of these things everywhere, it was strange. Now i know, cheers!
@hayleydodds8751 Жыл бұрын
I love this so much!!!
@mowu8459 7 жыл бұрын
captions: [CICADANOISE]
@KatyLee 6 жыл бұрын
2:09 LOL I'm actually watching it like that :D
@eatemadfanaee5954 5 жыл бұрын
THAT turn me on!
@unclefreddieDied 4 жыл бұрын
girls don't go to the bathroom
@Georgekaterini 4 жыл бұрын
One of the best videos I've ever seen. Really.
@ryanearnest9611 5 жыл бұрын
It's August 2019 and I have never seen Soo many in my life! I'll take a pic of one of my trees that have thousands of shells!
@alialkoot7202 5 жыл бұрын
That’s literally what I’m doing 😂 2:11
@ruthenian.wisdom 4 жыл бұрын
What a "funny" joke
@rhaegartargaryen9315 9 жыл бұрын
Would love that tee shirt, but 20$! Without knowing the quality, it's Shrodingers cat. Any plans on viewers discounts?
@efstrix 9 жыл бұрын
that joke about bush and clinton was very very good.
@bondedomao 5 жыл бұрын
2:10 I AM LITERALLY WATCHING THIS VIDEO ON THE BATHROOM. LOL. Thanks for letting the cicadas know!!!
@nathantagg2691 3 жыл бұрын
Title: "Why are Cicadas so Good At Math?" Me: 👁️👄👁️
@cicadaboi101 3 жыл бұрын
Hey I bet we're all confused here
@nobodyatall6620 8 жыл бұрын
C'mon, episode III wasn't that bad.
@matthewkinney5474 8 жыл бұрын
It was ok
@bagandtag4391 8 жыл бұрын
+Ethan Hendren and II? :x
@sadickess4108 8 жыл бұрын
||| was ok I guess
@sabarishmenon4924 8 жыл бұрын
This was legit the topic on one of my SAT passages
@jacquiz.6837 9 жыл бұрын
I'm moving to southern Illinois in a week. So excited to meet my new cicada brood!!!!
@SeanFictional 9 жыл бұрын
4:10 - I'm confused; IV is 4, not 17. That would be XVII. Am I missing something? ^^;;
@ntl5983 4 жыл бұрын
And XXIII is not 13 either... those are the brood numbers they were given, not the year cycles.
@superbere 4 жыл бұрын
All of the 12 shown first sleep for 13 years, and all of the remaining 3 shown in the second round sleep for 17. The numbers are just counting the 15 different species he mentioned.
@superbere 4 жыл бұрын
Ah i udnerstand your confusion now. All the species are shown at 1.30
@Josh-zx3rc 7 жыл бұрын
I remember when we thought jeb! Was going to win. Ahh
@MultiZoobear 4 жыл бұрын
I've never thought the cycle of prey and predators need to align with each other.
@saelk09 3 жыл бұрын
The images of cicadas give me chills
@1jvk1 7 жыл бұрын
Hillary Clinton Vs. Donald J. Bush
@johnm2345 7 жыл бұрын
What does this have to do with anything
@1jvk1 7 жыл бұрын
John Maki nothin
@alexrulz911 7 жыл бұрын
2:17
@MM-xm5vx 6 жыл бұрын
I think he meant Jeb Bush
@XxSOURCREAMxX 9 жыл бұрын
My buddy ninjask and shedinja
@MicrowavedCarrot 9 жыл бұрын
That is pretty cool! I want to know more. (:
@qrowing 3 жыл бұрын
Thanks for blaring the cicada noise. My headphones and my ears thank you for it. Great audio balancing.
@garethdean6382 9 жыл бұрын
Why? Because they have a proper educational system that's why. None of this 'no grub left behind' nonsense! The day our children start spending time buried in the dirt drinking sap is the day this country becomes great again.
@johnhan2621 5 жыл бұрын
Gareth Dean Lol funny but true
@twiniki5186 4 жыл бұрын
Cicada 2020
@cicadaboi101 3 жыл бұрын
Amen! Vote Cicadaboi 2020
@danidejaneiro8378 7 жыл бұрын
You say _cicayda,_ I say *cicahda.*
@limey4ever062 6 жыл бұрын
Gringo Show same
@wellesradio 5 жыл бұрын
Let's call the whole thing math.
@masona7219 7 жыл бұрын
I live in NE kansas and I remember when they emerged last year. these guys combined with the yearly cicadas where a noisy nightmare, but extremely cool
@mrsopu6937 6 жыл бұрын
WOW WHAT A INFORMATION!!!!!!!
@gyohza 5 жыл бұрын
Not to measure an animal's value, but it feels so unfair that cicadas can sleep for up to 17 years and emerge safe and sound, while dogs will rarely even reach a lifespan of 17 years :(
@LOL_MANN 2 ай бұрын
Just breed long lasting dog with longer telomeres ez
@minmax5 9 жыл бұрын
I would object to the invisible hand comparison, as the invisible hand doesn't exist, unlike cicada math.
@ganubh745 9 жыл бұрын
Wow! This is so interesting. That's so smart.
@sarahellie4113 3 жыл бұрын
“We’re all waiting for the new Star Wars trilogy! How was the last one? Don’t ask” Just you wait for the next one...
@jintaker113 8 жыл бұрын
This is a dumb question but what is Coca Cola supposed to taste like?
@minidwarfdude9230 8 жыл бұрын
Coca cola itself is a flavour. It tastes like itself
@ravinsur4114 8 жыл бұрын
No, the flavor is cola, coca cola is supposed to taste like cola. This is why so many other brands have their own colas that taste somewhat similar.
@simonenoli4418 8 жыл бұрын
tamarind and sugar and some chemical yet natural stuff
@cicadaboi101 3 жыл бұрын
Cicada jizz
@jintaker113 3 жыл бұрын
@@cicadaboi101 why is someone replying to a 4 year old obscure comment
@TheVoiceOfLiberty1 8 жыл бұрын
The last Star Wars was alright. No need for sliding that cheeky critical comment, nerd
@NutritiouslyHigh 7 жыл бұрын
He was talking about the prequels, which were not alright.
@CastelDawn 7 жыл бұрын
pfff, lol, fanboys are so ridiculous
@sana_IITD 4 жыл бұрын
How nature balances and feeds everybody with such delicate cycles
@mcchoke5926 4 жыл бұрын
😄 thanks that explain everything that im looking for 😄
@tahmid1897 9 жыл бұрын
FIRST!!1!
@bellawinmill8672 9 жыл бұрын
Great job [s]why couldn't it be meeeeeeeee[/s]
@noahwilliams8996 9 жыл бұрын
Rose Winill There there. I'm sure you'll be first Someday.
@jaredbrooks7764 9 жыл бұрын
Just not on days that end in y or a number :)
@bibasik7 6 жыл бұрын
*Blue shell*
@jalenrice5981 8 жыл бұрын
I hear that Perpetuum Mobile quietly referenced in the background at 3:00, good choice in background remix jingles if you did that on purpose
@elkiness 6 жыл бұрын
An early memory....I was absolutely fascinated by the cicadas when they came out in 1953 (I was 6 years old, already infamous for bringing ''cute'' bugs home to show off). At their crawling stage I wanted to bring some home--but thought my parents might not be delighted with my new pets. So I put them into a shoe box with nice big holes so they could breathe......and woke up with them crawling all over me!
@FoodNerds 5 жыл бұрын
I noticed that their song only happened once every decade, and that was what I was told. I figured that it was some kind of complex migration, but no. Wow! So interesting.
@AlvinLee007 8 жыл бұрын
Please do more after-show updates. It's very personal. =)
@AdarshKumar-nj7rp 6 жыл бұрын
Congrats on reaching 2 million subscribers
@chrisbrice4679 7 жыл бұрын
im so glad i got to see this first hand, the 17 year cycle ones at that. wont see em like that again till 2236
@Soarinsky 5 жыл бұрын
When an insect is better at math than you 😔
@TrickShotKoopa 5 жыл бұрын
1:23 you forgot 19 19: WHY YOU BULLY ME!
@amishrestha5141 Жыл бұрын
yes
@JJ-si4qh 7 жыл бұрын
This video has hilarious animations; please keep it up. Also, I'm in the bathroom watching this.
@isisfoster8293 6 жыл бұрын
lmaoo the computer bug bit had me dying for like 2 mins straight
@panzoidz3213 3 жыл бұрын
Time to force some cicada to do my math homework
@Aelfraed26 3 жыл бұрын
LMAO at that Star Wars joke
@adityasomisetty8557 6 жыл бұрын
RIP 2018
@imordeushellscream401 9 жыл бұрын
It so funny hearing their sound from the Video and from outside... they are in-sync !
@Burningtreeblood 3 жыл бұрын
2:08 ... you got me, yep yes I am
@wowhamba 9 жыл бұрын
This was one of your better videos!
@solaris9426 4 жыл бұрын
Fun fact: The Roman numerals he used were 23 (XXIII) and 4 (IV). 13 and 17 would be XIII and XVII respectively.
@ClassicalComposer85 3 жыл бұрын
Damn... I should of copy that cicada friend math quiz last semester
@slayer2450 7 жыл бұрын
I remember this happening once, it was pretty cool.
@awfullygenericname6783 7 жыл бұрын
Once I found a HUGE swarm of cicadas and found where they're emerging from,one lucky bird was there and tried to eat as much as it can
@KirkMoore 9 ай бұрын
I was today years old when I learned thet I am was in this episode. As the person eating a cicada. And I was really eating a cicada.
@xFRADAFHCIC 5 жыл бұрын
This explains cicada 3301's fascination of prime
@cjoelharrison 9 жыл бұрын
Fascinating
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