Can you find the thief by just looking at the picture below?

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?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

I am white when I am dirty, and black when I am clean. What am I?

Why is the Hole below a Lock?

There are five men, let's say Tarun Harish Lavesh, Manoj, and Manish. All of them have a dot mark on their forehead. They can't see the dots on their forehead but can see the ones on others. The owner of WHITE Dot is an honest person and will never lie, while the owner of BLACK Dot always tells the lie.

This is the statement from Tarun Harish Lavesh and Manish:
Tarun: 'I see 3 whites and 1 black'
Harish: 'I see 4 black'
Lavesh: 'I see 3 black and 1 white'
Manish: 'I see 4 white'

What colour is the dot on each of Tarun Harish Lavesh, Manoj, and Manish's forehead?

What do you answer even though it never asks you questions?

Can you replace the question mark with the correct number?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

If it took eight men ten hours to build a wall, how long would it take four men to build it?