Science Question 1:

"If a tree falls in the forest, and there's no one there to hear it, does it still make a sound?"

The falling of the tree will not make a sound, if there is no-one there to hear it. The tree falling will create vibrations and therefore cause sound waves. Unless there is a brain/ear to process the vibrations the falling of the tree will not make a sound. An eardrum and a brain needs to be present. These vibrations must be interpreted by a living person/animal. If not, the falling tree will not make a sound.