I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Do You See It?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

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?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

What is the next number in this matchsticks series riddle?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.