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

Can you replace the question mark with the correct number?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside.
The man said, "Oh! I am really sorry, I thought this was my room."
He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man.
What made her suspicious of that man? He might have been genuinely mistaken.

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Why 1729 is a magic number? Answer Logically.

Can you quickly find which two matchstick figures are identical?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

Can you solve the below geography rebus by decoding the below rebus ?