I look at you, you look at me, I raise my right, you raise your left. What am I?

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

How do you go from 98 to 720 using just one letter?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

I have an eye but still cannot see.

Who am I?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?