Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

Rearrange the letters in "new door" to make one word.

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Four children having five rocks each were playing a game in which they had to throw the rock at a particular solid area in the water. Child 1- Succeeded in throwing three rocks at a solid area but one of the rocks sunk. Child 3 - His aim was so bad that all rocks got sunk. Child 4- He was awesome and none of the rocks got sunk. Child 2 - Was the winner but was struck by a rock in the head and died. Who killed Child 2?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Which part of London exists in France as well ?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?