Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

There is something which is always coming but never arrives?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

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

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

The Little ant seems to be always confused. Do you know why?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?