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

which number am I?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Can you count the number of triangles in the given figure?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?

What is the riddle which can be asked all day with a different correct answer each time.

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

What will you call your mother's brother's brother-in-law?

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?