Large Hadron Collider is the world’s highest energy particle accelerator. In 2012  protons were running with a beam energy of 4 TeV. At the beginning of 2013, the LHC collided protons with lead ions before going into a long maintenance stop until the end of 2014. Running will resume in 2015 with increased collision energy of 13 TeV and another increase in luminosity.   LHC (situated in the northwest suburbs of Geneva on the Franco–Swiss border) generates the greatest amount of information that has ever been produced in an experiment before. It will also reveal some of the most fundamental secrets of nature. (A candidate event in the search for the Higgs boson, showing two electrons and two muons - Image: CMS/CERN) Despite the enormous amount of information available about this topic, it is not easy for non-specialists to know where the data come from. Basically, the purpose of this website is to help introduce and inform the public about the LHC experiment, and some simple physical calculations which take place in all particle accelerators. They can be used in secondary school classrooms in order to stimulate the curiosity of the students, help them understand the physical concepts of LHC, and they can also be used as an example of the relationship between the cold equations of Physics on the blackboard and the exciting scientific research. The calculations that you will be finding in this Website are adapted from the Physics of Secondary School and in most cases they are just very simple approaches to the correct results. It may be interesting to take a look at other websites which give simple description of Particle Physics. For example: An Introduction To Particle Physics or other links that you can find on this website. A Glossary with an alphabetical list of particle physics terms is included in the last section of this website.