A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

From a pack of 52 cards, I placed 4 cards on the table.

I will give you 4 clues about the cards:

Clue 1: Card on left cannot be greater than the card on the right.
Clue 2: Difference between the 1st card and 3rd card is 8.
Clue 3: There is no card of an ace.
Clue 4: There are no face cards (queen, king, jacks).
Clue 5: Difference between the 2nd card and 4th card is 7.

Identify four cards?

Count the squares in the matchstick puzzle below?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

How can you make a TV, a bed, a dog, and a car liquid?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

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?