One hot day, two hikers are walking in the dry, brown hills. They have been walking all day, and they are tired and hungry. They see a tree in the distance.  “I am sooooo hungry!” says one hiker. “Do you think that’s an apple tree? I want a big, crunchy, red apple!” “Nah, that’s not an apple tree," says the other. "It's a pear tree! Pears are my favorite. I want a sweet, juicy, yellow pear!" But when they arrive at the tree, there are no apples. Or pears either. In fact, there is no fruit at all...