You need to arrange three 7 and mathematical symbols to form number 1?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

What has hands, but can’t clap?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

I cannot talk, but I always reply when spoken to. What am I?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

Why is 6 afraid of 7?