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

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Take one out and scratch my head, I am now black but once was red. What am I?

I look at you, you look at me I raise my right, you raise your left. What am I?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

People make me, save me, change me, raise me. What am I?

I am quite hot but become too cold if you remove the first two letters. What am I?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

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