اكتشـــف عن طريق المصادفه ان هناك

Static electricity

With something of coincidence: types of materials would attract one another after being rubbed together for example after rubbing a piece of silk against glass, silk and glass would tend to stick together - attractive force اكتشـــف عن طريق المصادفه ان هناك انـــواع من الـــمـــواد تتجـــاذب الــــى بعضها البعــــض بعد دلــكــها مثــــل الــحــريـــر مـــع الزجـــاج بما يسمى قوى الجذب  

Became phenomenon: discovered that identical materials always repelled each other and ddifferent materials would attract one another - hypothetical fluids were being transferred from one object to another during the process of rubbing, and that these "fluids" were able to effect a physical force over a distance - [attraction and repulsion] اصبحت هذه المصادفة ظاهرة عندما وجدوا ان بعض المواد ننجاذب عندما يتم دلكها وبعض المواد تتنافر  وفسرت الظاهره على ان عندما يتم الدلك ينتج فيض افتراضى ينتقل بين المادتين اثناء عمليه الدلك