Why do people go to bed?

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

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

Trying to tease Birbal, Akbar gave him one gold coin and ask him to buy
* something for him to eat
* something for him to drink.
* something to feed the cows
* something to plant in the garden
and most important you need to buy only one thing.

What must Birbal buy to silence Akbar?

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

What is the next number in this matchsticks series riddle?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Can you divide the below-given shape into four equal and identical pieces?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?