- Hi everyone. My name's Ava.
- And my name's Alexis.
- And we are the McClue twins!
(upbeat music)
- Okay, Dr. Mike. As you can see we're twins.
- I could see that.
- Yeah, because you have eyes.
- And?
- Because you're a doctor.
- You're a doctor.
- I'm a doctor.
- I think you can tell.
- So you're going to tell us what really twins are.
- Do you know there's actually two types of twins, right?
- Yeah. Fraternal twins.
- And?
- Identical twins.
- Which one are you?
- We're identical.
- You're identical?
No, are you tricking me?
- No.
- No, I know you're identical. I'm joking.
So, twins are obviously born on the same day.
- Yeah.
- Pretty much the same time.
- Yeah.
- Sometimes one comes out first.
Who's the older one?
- Me. I'm one minute older.
- That means she's an old lady.
- Does that make you stronger?
- Yeah.
- No, that makes me stronger.
Because I got more time to develop my muscles.
- The difference between identical twins and fraternal twins
is identical twins are in the same fertilized zygote.
Like a goat, the animal.
But you put zy before it.
Zygote.
- Zygote.
- So one egg. One sperm goes in and then it splits in two.
But its from the same egg.
- But fraternal twins...
- Are two separate eggs.
So if Mama Bear dropped two eggs and both got fertilized
that would be fraternal twins.
- So we're squished together?
- So you guys were basically squished together
in Mama's belly.
As identical twins.
When you come to see me as a doctor,
well when the mom comes to see me as a doctor,
we measure the mom's stomach to see what
the approximate date is of the pregnancy.
- Oh so when it's going to come out?
- Yeah.
And we do an ultrasound. You know what an ultrasound is?
- And you get a heartbeat.
And you get a heartbeat.
How do they know if it's a boy or girl?
- When we do the ultrasound?
We can actually see the body parts.
But its not always right.
It's imperfect sometimes.
So sometimes we think it's one,
and it turns out something else.
Because science is interesting.
- Yeah it is pretty interesting.
- Well so you know you can't be a brother and a sister
and be identical twins.
Because identical twins share the same DNA.
- A brother and a sister are like
- Fraternal.
So you can have a brother and a sister that are born
at the same time
but they come from different eggs.
So they have slightly different DNA.
But you guys have the exact same DNA.
- What's a DNA?
- You don't know what DNA is?
- No.
- Can I teach you?
- Yeah.
- You know what instructions are?
- Yeah.
- Okay so, your body needs instructions.
Every little cell in your body needs instructions
on what to do.
- And your brain does that.
- The DNA gives it the instructions.
The DNA is the genetic instructions.
- Because what tells your brain?
- Exactly. To become a brain.
Well what tells your skin to be your skin
or your nails to become your nails.
Or your hair to become your hair.
- You might become arms on your face!
- Or my eyes to see!
- Exactly.
So you need instructions.
So this is really cool right?
Your body, in order to make copies of the DNA, right,
it constantly makes copies so you can get
more and more cells, right?
So if you get a cut, it heals, more cells come.
The cool part about this is sometimes your body
makes mistakes when it makes copies, right?
- Mhm.
- But then your immune system usually fixes it
but sometimes the mistakes stay.
So for example, do you see these freckles that I have on me?
- Yeah.
- Those are basically little mistakes that my skin made.
Right? No big deal.
Do you know what we call these mistakes?
- No.
- Mutations.
Have you heard that word before?
- No.
- So these mutations are usually harmless. Right?
- Mhm.
- And the difference between you and you sister,
like for example, maybe one of your toes is different.
Even though you have the same DNA,
some things might be slightly different
because of a little mutation.
- Do I have any of those?
- I have one in between my toe.
- Here, here. Like you have it a little bit here. See this?
- Oh but, right there.
- Oh there. Right there.
- Yeah, right there.
- Yeah see, you don't have one of those.
That's a scar.
How did you get that?
- I fell. I scraped myself, my skin off.
- And look, this is from door.
- [Dr. Mike] Ooh. That hurts.
- Why do the babies kick?
- Because they want to.
- Or maybe they're, like, boxing.
- Yeah! Maybe they're doing Taekwondo.
- They're trying to fight!
- They're not going to hurt each other.
They're so little.
And everything is soft and gooey in there.
There's padding.
- Wait do you mean it's not just.. It's empty?
- No it's not empty.
There's like fluids.
- Do they float?
- Yeah.
(Ava gasps)
Do you guys have the cellphones that can open up
with your fingerprint?
- No, no, no. Only the iPad.
- Yeah.
- Oh, the iPad.
So you know you can't open your sister's iPad.
- Because it's different.
- Why?
- Fingerprint.
It's a mess up!
- It's a mess up and I'm going to tell you
another cool fact.
- When you're inside your mama's belly, right?
You guys have to compete with space, you're moving around.
One person has more room.
One has less room.
Because of that, things change.
Remember, your DNA, your instructions, are exactly the same.
But because of the environment
and because of those mistakes that sometimes can be made,
even your fingerprints are slightly different.
Let's say if I test your hair and your hair,
it would be identical.
Yet, when I look, like at your freckles here,
you have one freckle that you don't have.
And then you have a freckles that you don't have.
But yet you have the same instructions.
You came from the same egg.
- We did?
- Yeah.
- Wait, we were in the egg?
- You were.
- How did they make a baby?
- I don't know! That's a question for Mama Bear!
- A baby making dance!
So that's why we lost teeth
but we didn't lose the same part of the teeth.
- Because the environment.
And how much space you had in your mom's belly
and how much you're brushing your teeth now
and the foods you eat now.
All of that changes everything.
- The breath just smell like stinky.
- Just like my sister's a little bit taller.
- Who's breath is stinky breath?
- [Ava] My sister.
- [Alexis] My sister's.
- Who has the stinkiest breath, raise your hand.
- You!
- No, not point! I said raise a hand.
You!
- No!
- Raise your hand.
- Fine.
- Yeah!
- That's only because I'm old.
- Yeah. You do have pretty disgusting breath.
- Sorry.
- So an identical twin
is two people in the same egg
and fraternal twins are people that separate.
- Yes.
Do you know how many, out of 250 pregnancies,
how many of them will be twins?
Identical.
If you had to guess, out of 250.
- 100.
- A thousand.
- What? Out of 250?
- Oh no, no, not a thousand.
- 200.
259.
- 50.
- Okay. It's one.
(Dr. Mike laughs)
- Mike, if you're so smart,
then do you think you can tell us apart
if we're dressed the same?
- Yeah man.
- I think so.
If I can use my stethoscope to listen to your brains.
- Nah, don't do that.
- Okay.
- Okay, try to tell use apart.
- But you're not dressed the same.
- Wait, close your eyes.
- It's time to play Guess That Twin!
Oh no, this is hard.
Okay. First, I'm going to tell a joke.
(giggling)
Knock knock.
Peanut butter jelly.
- Cover your mouth!
- Now you're covering your mouths too?
This is crazy.
I have to judge based on your eyes?
- And nose!
- If I guess it wrong, I have to do twenty pushups.
- Actually, okay yeah.
- If I guess it right, you have to do twenty pushups.
- Ava stop!
Ava!
- Okay.
- [Woman] You just told her!
- I think Ava is sitting right here!
- No!
- I'm confident.
- Yes! You win.
- Let's do it again, let's do it again.
- No, I got it right!
I want my pushup!
Pushup!
- [Woman] You know what I fell for?
She's saying, Ava stop.
I'm like, you're telling on yourself!
- Yeah.
- But she was trying to trick you.
- Five, six, seven.
- Wow, they're strong.
I can tell you how I knew.
- [Woman] How'd you know?
- Because the feet were exposed.
- Because I had this, remember.
- [Woman] Yeah, you told him.
- Yeah, she told me about the door.
- [Woman] That's how you know he was listening, girls.
- [Alexis] Subscribe.
- [Ava] So thank you for watching.
- [Alexis] Ava!
Subscribe. Turn on the notifications.
Ring the bell, put a heart.
Thumbs up.
- Yes.
And subscribe to Dr. Mike!
- And us!
- And Mike and yeah that's it.
- Thank you, bye!
- That's it.
(upbeat music)