The Man with a Stick of Chalk.

By the time you read this entry you will probably have read the news about gravitational waves and how they have been checked and verified by The Laser Interferometer Gravitational-Wave Observatory (LIGO) located in the United States. This news, despite being a world trending topic, has been understood by a small group of people. Although, most people who are not in the field assume this detection is final proof that the theory of relativity is correct. Accordingly, once again we find new reasons to admire Albert Einstein. In this sense, I would like to highlight how important using imagination as well as thought experiments were in this discovery (gedankenexperiment, as Einstein himself called). Note that there were not any computers or electronic devices that could have been a help to Einstein at the time he made his theories, so he did his work by himself. Actually, his available tools were a piece of paper, a pen and a stick of chalk, as you can see in the famous picture took at Princeton University.  This picture showed Einstein writing his famous equations on a blackboard. Something similar happened when the Scottish physicist Maxwell theorized that electromagnetic waves existed many years before they were verified by Herz. In a nutshell, there is nothing more powerful than human intelligence and talent.