Good Riddles

Question: How can you make the following true by adding a single line: .9 = 1.

Note: ≠ is not the answer.

Question: A Florida man is running down a hall with a piece of paper. The lights flicker and he falls to the ground in tears.

What happened?

Question: I have no eyes, ears, tongue, or nose.
Yet I see, hear, taste, and smell everything.

What am I?

Question: I'm fat and I'm round and I cause much joy, I'm often a dogs favorite toy. What am I?

Question: You wear me every day but you never put me on.
I will change colors if you leave me out too long.

What am I?