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Speaker 1: Hey, everybody, it's Josh and Chuck is here in spirit too,

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Speaker 1: and we just wanted to drop a casual reminder that

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Speaker 1: we are going to have a swinging Pacific Northwest Swing

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Speaker 1: this coming February, and tickets are now on sale. February

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Speaker 1: one will be at the More Theater in Seattle, February

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Speaker 1: two will be at Revolution Hall in Portland, and on

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Speaker 1: February three, for SF Sketch Fest, will be at the

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Speaker 1: Sydney Goldstein Theater. Go check out all of our social

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Speaker 1: media's for more information and links to tickets, and we'll

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Speaker 1: see you in February. Hey, I'm welcome to the Shorts

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Speaker 1: to Find Josh and there's Chuck tally Ho. It's short

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Speaker 1: Stuff time and we're talking about something that admittedly I

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Speaker 1: kind of understand and kind of hope you really understand.

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Speaker 1: I do good. I do. Also, before we started, wanting

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Speaker 1: to give a hat tip to my wife, you me

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Speaker 1: who came up with this one said have you ever

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Speaker 1: heard of this? It's crazy? And I looked into it

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Speaker 1: and I was like, this is crazy because what you

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Speaker 1: we found and what we're about to explain to all

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Speaker 1: of you is that humans are a species. Don't forget

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Speaker 1: we're animals with stripes. We actually are a striped species

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Speaker 1: of animal. Did you know that before? I've never heard

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Speaker 1: of this. I did not know we were all brindle

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Speaker 1: coated animals like my dog Nico. Yeah, that's exactly right,

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Speaker 1: that's exactly what we are. We have beautiful patterns of

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Speaker 1: swirls and whorls and drips and drops and all sorts

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Speaker 1: of cool stuff all over us, but we can't see

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Speaker 1: them normally under normal circumstances because we don't see on

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Speaker 1: the UV side of the spectrum. But if we did,

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Speaker 1: we'd be like, hey, I like your stripes. Oh, I

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Speaker 1: like your stripes. And with some people, depending on the

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Speaker 1: condition they have, they actually their stripes actually show. It's

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Speaker 1: pretty interesting stuff. But the whole thing we're talking about,

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Speaker 1: if you noticed, um the title of this episode, or

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Speaker 1: what are called blash cos lines, those are the stripes

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Speaker 1: that all humans have. Now did this happen? Because you

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Speaker 1: mean had a black light and went, oh my god,

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Speaker 1: I don't know where she turned this one up. I

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Speaker 1: didn't ask her. I'll have to ask her and then

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Speaker 1: we'll record a pick up. All right, So hold on

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Speaker 1: insert answer here. Uh So, blash cos lines that is

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Speaker 1: in fact a name. Uh. It was named after a dermatologist,

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Speaker 1: Alfred Blaschko and the nineteen hundreds. He was the first

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Speaker 1: person to uh notice this basically and write about it. Um.

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Speaker 1: He thought he was a little bit off though, because

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Speaker 1: he thought that they followed predefined patterns on humans. Um.

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Speaker 1: But they don't. And the weird thing is is you

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Speaker 1: might think is like, all right, so maybe these are

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Speaker 1: um lines that sort of indicate where your blood vessels

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Speaker 1: are or your nerve endings are, or your nerves or whatever. Um,

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Speaker 1: that is not the case. Uh, these stripes are not

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Speaker 1: blood vessels that you could see under a black light

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Speaker 1: at all. But we kind of know what it is now,

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Speaker 1: right right, Yeah, there's no system in the body that

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Speaker 1: these things follow. Instead, they're their own thing. They seem

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Speaker 1: to be their own thing, um, and they are distinct

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Speaker 1: on all people. But there are kind of some general

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Speaker 1: patterns that we'll talk about. But what what we've come

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Speaker 1: up with finally today is still today we're not certain

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Speaker 1: that this is correct, but the general consensus is that

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Speaker 1: what blash cos lines are evidence of the migratory route

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Speaker 1: that our skin cells took and then settled into while

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Speaker 1: we were developing in the womb. Right. Um, I'm just

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Speaker 1: gonna read this little bit from mental Flass because I

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Speaker 1: think it kind of sums it up nicely. Yeah. I

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Speaker 1: thought so too, And we always love to shout out

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Speaker 1: our our old pals at Mental Flass, the m f fs,

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Speaker 1: the ms uh. Basically, they said, these are cellular relics

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Speaker 1: of our development, basically from single cell uh things you

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Speaker 1: quoting this, No, I'm paraphrasing the beginning. Um, as the

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Speaker 1: cells of I did, they differentiated, some became muscles, others bones,

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Speaker 1: still others organs, and some became skin. As those skin

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Speaker 1: cells continued dividing, they expanded and stretched to cover a

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Speaker 1: quickly growing body. One cell line pushed and swirled through

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Speaker 1: another like steamed milk poured into an espresso to make

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Speaker 1: a latte, and Blash goes. Lines are the molecular evidence

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Speaker 1: of those swirls. It was very pretty writing. It was.

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Speaker 1: So the reason that we can see these lines, Chuck,

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Speaker 1: I think we should talk about after a break. So

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Speaker 1: the reasons we can see these lines, Chuck, I think

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Speaker 1: we're you talk about now? Very nice. So, Um, they

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Speaker 1: believe that the reason that there's differences even though you

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Speaker 1: can only see them under the UV spectrum. Under normal,

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Speaker 1: normal circumstances, you cannot see the difference between skin cells

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Speaker 1: on your arm, or on your shoulder, or on your

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Speaker 1: torso wherever, and you have blash cost lines all over

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Speaker 1: your body, as we'll see, because the cells that make

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Speaker 1: up our skin are almost entirely identical. They all come

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Speaker 1: from generally the same genetic information, so they all start

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Speaker 1: out from the same cell or gloves of cells. Like

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Speaker 1: mental falls pointed out, UM, But because of like the

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Speaker 1: different minute experiences that each cell has, those instructions get

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Speaker 1: produced and just slightly different ways, so that um, we

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Speaker 1: think of ourselves as like genetically monolithic beings. Right, It

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Speaker 1: turns out the term for humans UM are mosaics. All

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Speaker 1: of those cells are so slightly different that it's almost

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Speaker 1: like slightly different colored tiles being put up against one another.

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Speaker 1: And they're so similar that again, under normal light, you

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Speaker 1: can't see the difference. But when you put the put

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Speaker 1: yourself under a black light in a dark room, those

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Speaker 1: differences show up. That's why they think we're able to

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Speaker 1: see blash cost lines. That's why they think we have them.

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Speaker 1: It's the same reason when you look at identical twins.

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Speaker 1: They're they're actually a little bit different. Is again these

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Speaker 1: environmental factors that happen when you're a twin and and

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Speaker 1: in fact, uh, we just did an episode recently, what

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Speaker 1: was that on just this week on Doppelgangers. Doppelgangers when

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Speaker 1: they've seen a lot of evidence like when twins are

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Speaker 1: split up at birth, Um, they end up being quite

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Speaker 1: a bit different. And it's because of epigenetics. Isn't these

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Speaker 1: environmental factors. But even if they they aren't broken up,

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Speaker 1: even if they're together, these twins are these you know,

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Speaker 1: these minute little jenette differences that end up meaning these

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Speaker 1: twins are a little bit different. And that's the same

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Speaker 1: basic concept here. Yeah, but rather than whole people, we're

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Speaker 1: talking about the difference between genetically identical cells within one person.

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Speaker 1: There is something else called chimerism. So instead of mosaicism,

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Speaker 1: this is chimerism. And some people can have different genetic

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Speaker 1: material within them. So like um, very famously people with

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Speaker 1: two different eyes, they're chimeras, or they they're chimeric, I

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Speaker 1: should say, because different genetic information went into constructing each

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Speaker 1: eye and that's why they have two different colored eyes.

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Speaker 1: That's extraordinarily rare mosaicism apparently is universal that we're all.

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Speaker 1: We're just not if you took one cell in another

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Speaker 1: cell and you could get as granular as possible and

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Speaker 1: investigating them, you'd see that they're just slightly not the same,

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Speaker 1: even though they came from the same blueprint. Yeah, there's

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Speaker 1: a New York Mets picture that has one blue eye

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Speaker 1: and one dark eye? Is that David Bowie number seventy two.

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Speaker 1: It's Max Scherzer, And uh boy, it's just I didn't

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Speaker 1: even notice it until last year. And this is a

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Speaker 1: guy who's sort of at the latter stages of his career.

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Speaker 1: But then once you see a picture of this guy,

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Speaker 1: you're like, oh my god, it's really a striking difference

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Speaker 1: because it's a very very blue eye and a very

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Speaker 1: very brown eye. Uh and I just think it's so

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Speaker 1: cool looking. Yeah, like what a I don't know. I

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Speaker 1: would just always just go right up to people's faces

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Speaker 1: and and go, hi, how are you just like freak

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Speaker 1: him out a little bit? I think it's really cool.

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Speaker 1: Give him the left side, and then the right side,

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Speaker 1: and left side and the right side. Yeah. So, like

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Speaker 1: we said, they're like there, there's kind of some general

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Speaker 1: rules that like these lines will follow depending on where

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Speaker 1: you are on your body. Right, Yeah, there's like patterns,

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Speaker 1: which makes sense because you know all of us sort

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Speaker 1: of grow generally in the same way as far as

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Speaker 1: arms and legs and finghies and toes and torsos and

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Speaker 1: necks and armpits and all that stuff. So depending on

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Speaker 1: what can we keep naming parts about the dirty parts,

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Speaker 1: let's start, Um, they're only two. Uh So when you're

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Speaker 1: looking at a body, like there will be maybe a

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Speaker 1: V shape down your back, uh and inverted you from

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Speaker 1: the breast to the upper arm. Your lateral trunk will

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Speaker 1: have a wave like shape. There might be an S

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Speaker 1: shape on your abdomen, stuff like that. Yeah, your scalp. Actually,

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Speaker 1: if you look at your whole head, it looks like

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Speaker 1: as far as your blash co lines are are concerned,

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Speaker 1: that you're wearing a ball of clava like around around

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Speaker 1: your eye areas open, but there's different like lines surrounding

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Speaker 1: it elsewise, and apparently on your scalp at spirals, whereas

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Speaker 1: on the side of your face it comes there like

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Speaker 1: kind of vertical lines. It's pretty cool. There's um, I

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Speaker 1: think blash Coo himself, did you know, some initial um

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Speaker 1: descriptions of it through sketches, but since then science has

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Speaker 1: really kind of gotten pretty good at drawing it. So

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Speaker 1: there's a lot of neat drawings of blash cos lines

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Speaker 1: on on the Internet of all places. But was he early?

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Speaker 1: He was like nineteen o one from what I saw, Okay,

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Speaker 1: the earliest. But Chuck, I think you should take the

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Speaker 1: fact of the short stuff, um, that the blash cos

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Speaker 1: lines don't just exist on the skin, right, Yeah, this

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Speaker 1: was pretty freaky. Um. Apparently your teeth and eyes and

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Speaker 1: tongue all have blash cose lines as well. Yeah, which

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Speaker 1: I mean anything that that forms from cells, you know,

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Speaker 1: expressing themselves, writing poetry and songs. You mentioned earlier though

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Speaker 1: about there are certain conditions that someone might have where

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Speaker 1: these lines are revealed in in regular light with regular vision,

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Speaker 1: right yeah, yeah, so vital eye where your skin loses

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Speaker 1: its pigmentation. Um, it often follows blash COEs lines. Um.

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Speaker 1: Also there's other types of congenital conditions, I believe, and

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Speaker 1: some inquired ones where um, so vidaigo would be like

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Speaker 1: a negative of your your blash COEs lines, whereas the

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Speaker 1: some of the other ones, they're like it's like a

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Speaker 1: tiger stripes. Like you can see the person's blash COEs

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Speaker 1: lines because it's hyper pigmented, so you can see them

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Speaker 1: without UV light. You can just see him under normal

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Speaker 1: visible light. And it's pretty cool looking, actually, I have

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Speaker 1: to say yeah, although usually if you look up on

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Speaker 1: the internet see what this looks like, it's just like

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Speaker 1: close ups of armpits and stuff. Sure, sure, and I

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Speaker 1: say it's pretty cool looking. I don't know how you know,

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Speaker 1: somebody who has a condition where their blash goes lines

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Speaker 1: are showing all the time feel about it. But as

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Speaker 1: an observer, I think it's pretty interesting and neat. And

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Speaker 1: then also when you stop and think about if you're

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Speaker 1: like that person's skin is striped, your skin is striped

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Speaker 1: to pal you just don't see it because you have

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Speaker 1: to see it under normal UV lights. Yeah, pretty cool. Yeah.

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Speaker 1: So that's it for blash Coast Lines a A thanks

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Speaker 1: you me and thank you friend for listening to this episode.

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Speaker 1: Stuff You Should Know is a production of I Heart Radio.

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Speaker 1: For more podcasts my heart Radio, visit the I heart

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Speaker 1: favorite shows. H