How to tell what version of Drupal are you running

A lot of folks vom across a question asking themselvs and others:

What version of Drupal am I running ?

The easiest way I tell them to find out, is to log in as the Drupal administrator, go to /admin/logs/status page

So if your website is called http://somesitename.com and Drupal is installed in the root, you should go to http://somesitename.com/admin/logs/status