What is so fragile that saying its name breaks it?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

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?

Why do we preferably have round manhole covers and not square ones?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Move four matchsticks to the below square to form three squares?

How many letters are in the alphabet?

Solve the alphametic puzzle by replacing the alphabet with the number.

S T O R M +
S O L E S
=========
T O W E L
=========

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?

What is the longest word in the dictionary?