What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

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 ?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

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

A B C D E F G H

These are the letters given to you. Now you have to find out the letter that comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F.

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?

What occurs twice in a week, once in a year but never in a day?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

One night, Louis and Adam were sitting together. Adam was watching a movie while his wife Louis was reading a mystery book. Suddenly the power went out and Adam decided to go to bed, but strangely Louis kept on reading. There was no artificial light around, so Louis kept on reading. How come?

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?