To inifinty and beyond

I like messing with the kids on the car rides to school. So a couple of days ago we had a really interesting discussion about math. Now you have to remember they are 4-5 year old kids:

Evan: Do you know what the biggest number in the world is?

Abba: I think I do. Do you know what it is?

Evan: Yes, it's a googol.

Abba: How big is a googol?

Evan: It's got a lot of zeros.

Abba: That's right, it has a million zeros (actually my bad it only has 100 zeros).

Evan: Wow! How did you know that?

Kiki: Yeah, Abba, how did you know that?

Abba: You might not think it, but I know a lot of stuff.

Kiki: Is that the biggest number in the world?

Evan: Yes!

Abba: Well, actually, there are bigger numbers. Like, googol plus one.

Evan: That's not true.

Abba: How about two googols? Or 100 googols? Or a googol googols?

Kiki: Well, I know the biggest number in the world!

Abba: Really, what is it sweetie?

Kiki (whispering to Evan): Evan, what is the biggest number in the world?

Evan: I told you already, it's googol.

Kiki: The biggest number in the world is 8 million, 500, 80, 90, 100, 150 (whenever she gets to the big numbers she starts to confuse them a bit).

Abba: I know one number that is bigger than that.

Kiki: Really?

Abba: Yes, it's 8 million, 500, 80, 90, 100, 150 and one.

Kiki: Hmmmm....

This is where the kids were in deep thought/confusion for several minutes.

Kiki: I know the biggest number in the world!

Abba: What is it?

Kiki: It's called the "Biggest Number in the World!"

Abba: What about the "Biggest Number in the World" plus one?

Kiki: Stop it Abba!

Abba: What about the "Biggest Number in the World" plus two?

Kiki: STOP!

Abba: You're kind of right, you know?

Kiki: Why?

Abba: There really is no such thing as the biggest number in the world, because you can always add one more to it. So they call it infinity.

Kiki: Infinity?

Abba: Yeah, and you know what inifinity plus one is?

Kiki: No.

Abba: It's still inifinity.

And I didn't hear another peep out of them until we got to school.