"Can't say for sure, but I never saw one then, I mean after the sun had set. But if we don't see it in the morning I reckon we'll have to let it go at that."
"I think you're wrong, Bob," Jack said as the captain paused.
"How come?"
"Because the refraction of light wouldn't do it."
"How do you know it wouldn't?"
"Because we really see the sun for some time after it has set. That's because of refraction. So after we can't see it it would be too far below the horizon. I'll have you understand that I didn't make 97% in physics last term for nothing."
"You win. Go to the head of the class," Bob laughed.
"And another thing you seem to have overlooked, it was too cloudy when the sun set for a mirage anyhow."
"Bull's eye again, professor," Bob laughed. "And now maybe you can tell us just where the island really did go."
"It didn't go anywhere," Jack retorted, flushing slightly at Bob's tone. "It's right where it's been all the time."