Logic Riddles

Question: What is older than Obama, sits still as stone, but in some people's eyes is more appreciated than the president's home ? Hint: HIS nickname has Two words and starts with H and the second with A.

Question: I have existed for centuries, but last only a month. What am I?

Question: You walk down a path through the woods everyday. You always walk by one particular large rotting log which weighs over a ton. The next day you notice that there is another large log underneath the familiar one that you've never seen before. How did it get there?

Question: Why is the man standing in the sink?

Question: Twelve pears hanging high, twelve men passing by. Each took a pear and left eleven hanging there. How can this be?