Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

How many letters are in the alphabet?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

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