The Tunis Science City will play host to a new exhibition about mechanics and engineering at the temporary exhibition pavilion. It invites public to unscrew the covers, open the boxes, lifting the cowlings and discover with delight the amazing technical tricks behind our everyday objects. In our everyday life, ball bearings are most of the time invisible, but necessary. What are they? How do they work? Why are they hidden? Without them, no industrial machines would work. The creation of new applications may result of an anomaly. A concrete example is the vibrator of a mobile phone. From the Archimedes screw to the Maltese cross and the invention of windscreen wiper, this exhibition takes the public to the everyday life to discover, with an interactive way and without any complexes, the world of technology.