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.

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?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Which Burger Is Different in below image?

What is the riddle which can be asked all day with a different correct answer each time.

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

It can be easily calculated that the digits 0 to 9 can be arranged into 3628800 distinct ten-digit numbers.

But do you know how many of these numbers are prime?