Can you find the key in the picture below?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

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?

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

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

How is a fly different from a mosquito?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Our product and our sum always give the same answer. Who are we?