Good Riddles

Question: Different lights make me strange,
for each one my size will change.

What am I?

Question: Drop me and the world will shatter,
and you can always find me where you empty your bladder.

What am I?

Question: If you're in 3rd place and you passed the person in 2nd, what place are you in?

Question: Flies hate us with a passion, who are we?

Question: A smart landscaper is given the task of placing 4 trees so that they are all the same distant away from each other.

How does he do this?