Science Corner.(differentiate between moth and butterfly)

Boy: by what mode can I tell whether you are a butterfly or a moth?
Butterfly: When I land, I clutch my wings straight up. That's in what manner you know I'm a butterfly millers rest with their wings on the outside flat, like the single on that tree.
Word Wheel
Between the spoke of this word wheel are seven alphabetic characters and there is single letter missing. The word reads clockwise, on the contrary we aren't telling where it starts. Can you figure on the outside what the missing letter is?
The word is children, and the missing alphabetic character is D.
What Would You Do?
What would you do if...
* all of your friends were