Once, one person asked Einstein: "Sir, will you please tell me the theory of relativity which you found; I couldn't fix it in my mind!".
Then Einstein explained with a simple and real-life example.
That is: If anyone, sits you on the pan then you will feel one sec as an era; and if you sit next to a beautiful girl, you will feel one era as one sec.
''That is the theory of relativity'', he said.
What a lovely story!