Be active and find the killer in the picture Riddle below.

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

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?

The answer I give is yes, but what I mean is no. What was the question?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?