Our product and our sum always give the same answer. Who are we?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

What has 13 hearts but no other organs?

Can you solve below mathematical equation?

2^1234 - 2^1233

What 5-letter word typed in all capital letters can be read the same upside down?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

How can you tell a raw egg from a hard-boiled egg?

During which month do people sleep the least?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?