What is the below Rebus indicate?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

Can you decipher the below rebus?

PBLUESAISNUERSES

A man dies of old age on his 25 birthday. How is this possible?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

John and his wife were living in a rural place. On a particular day, John's wife fell ill and he called the local doctor. When the doctor picked up, he said, "Doctor, my wife is ill. She might have appendicitis."

"This can't be possible! I took out her appendix two years ago myself," the doctor explained.

When diagnosed, John's wife was found to have appendicitis. How can this be possible?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?