Scene: In the car on the way home from church.

The Girl: Mommy, can I tell you something?
Me: Yes, Sweetie.
TG: I have a really good idea, but it would take a long time to do.
Me: What is your idea?
TG: Well, it would be a really good idea to get a special watersuit that holds like 1000 pounds of oxygen.  Then you could go in the ocean, really deep, all the way to the bottom, and walk across the world and come out at China.  Or you could get a special heat suit that doesn’t get really warm, and dig through the earth’s core, and come out in China.  Or maybe Egypt.
Me: Wow.  That really would take a long time.
TG: Which do you think is more likely, Mommy.
Me: I don’t think either idea is very likely, although they are very cool.  I like the way you think.
TG: But if you could do one, which one do you think is more likely to happen?
Me: What is more likely to happen?  Walking through the earth’s core or walking through the ocean to China?  Like digging a tunnel through the center of the planet or jumping into the Atlantic and walking across the bottom until you reach land?
TG: Yes.
Me: Well, I’d have to say walking through the ocean and coming up in China is more likely.  But you’d have to start in the Pacific, since that is closer to China than the Atlantic.
TG: That’s what I thought.  It would just be too hot walking through the earth’s core.
Me: It woud be very hot.  It would also be really heavy to carry enough oxygen to walk all the way along the bottom of the ocean from the US to China without having to surface for air.
TG: Sure, but it’s more likely.
Me: Yes, it’s more likely.
TG: That’s what I want to do, then.  Do you think I can do it, Mommy?
Me: I think if you do it, you will be very famous for having invented the gear you need to do it and for having done it.  I think you would be in the Guinness Book of World Records.
TG: Will you come with me, Mommy, when I do it?
Me: Absolutely.
TG: Yay!