David: What magic power do you have?
Debby: I can see in the dark.
David: Like a lizard?
Debby: Lizards can see in the dark?
David: Yes.
Rose: Like the gecko.
Debby: Wow.
Rose: Your eye has rods and cones. You have more rods, and they let you see in black and white. The cones let you see in color, but there aren't as many, so you can't see in color at night. The gecko just has cones and more than you, so it can see color in the night. That's because it has so many predators.
Debby: Wow.