Good Riddles

Question: A man builds a rectangular house. After he builds the house he wants to place a clock on a south wall. Because there are so many south walls he places the clock on a random wall. He sits in front of the sits in front of the clock for ten minutes until he hears a knock on his font door. The man opens the door to see a bear on his front porch. The bear kills him. What color was the bear and why?

Question: A box without hinges, key or lid, yet inside, gold treasure is hid. What am I?

Question: A shield can reflect projectiles which travel at 4/5 of their original speed after being reflected. A missile is shot towards the shield at 700 km/h. At what speed did it go after its reflection?

Question: Which tool doesn't have a licence, but drives.

Question: When you are born, all you have is me. And even though you're powerless, you are filled with glee. What am I?