Answer:
Humans have two that shrink in the light and expand in the dark
Old people and owls are said to be this.
Where can you find roads without cars, forests without trees and cities without houses?
What has one hand longer than the other, and goes on all day and night?
Bobby likes Jimmy but not Joe, apples but not pears, jeeps but not vans, shinny but not hockey, tennis but not squash. Who will he like, Sara or Sally?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?