If an electric train is travelling south, then which way is the smoke going?

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

Can You Find the Missing Zero? A Number Puzzle that Will Trick Your Eyes

What do you see in the image below

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

What does this rebus riddle mean?

Readers with the eyes of a hunter can find the snake in the field. Can you? Test your puzzle-solving skills now!

Count the squares in the matchstick puzzle below?