An Expert is a Person who has Made all the Mistakes.

“An expert is a person who has made all the mistakes that can be made in a very narrow field.” – Niels Bohr

Niels Henrik David Bohr was a Danish scientist, who has made fundamental contributions to understanding the atomic structure and quantum mechanics.  For his scientific research he was awarded the nobel prize in Physics in 1922. Bohr was collaborating with many of his contemporaries such as Heisenberg and Schrödinger at his institute in the capital of Denmark — Copenhagen.  Later in his life Bohr was involved in the Manhattan Project (development of the atomic bomb).  Bohr was one of the most influential physicists of the last century.