People put me on the table and cut me but do not eat me. What am I?

What does below Rebus say?

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Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

what does this below rebus represent identXQQQQQME

A couple went on a climbing trip. But only the husband returned from the vacation and said that his wife slipped off while climbing and died. On investigating, the local sheriff arrested him saying, 'Your travel agent called. You murdered your wife.'

The man did not inform anyone about the trip. Then how was the agent so sure that it was a murder?

Complete the table series riddle by finding the number that can replace "??".

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

I got a bee but no honey.
got an eye but am still blind.
got a sea but no water.
got a tea but no coffee.
got a why but no answer.

What Am I?