I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Prove that twice of ten is the same as twice of eleven.

What do you answer even though it never asks you questions?

What seven-letter word has hundreds of letters in it?

Can you place six X (crosses) in below board without making three in a row in any way ?

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

With the help clues provided in the image, can you find the 5 digit key?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?