THERE ARE VARIOUS SCIENTIFIC inventions that have changed human life completely but only a small proportion of people know about their Inventors. Here are some of the Inventions whose Inventors aren't much popular. 1. Air Conditioner Summer season is going on and temperature is on the peak. Hot days and nights have made our lives very Bad. but we, Humans of 21st Century have a temporary escape/solution for this season which is none other than air conditioner. 'Air conditioner ' have made human life very comfortable by providing us relief from Hot Days and nights. Every 4 out of 10 People are using Air Conditioner in their life but only a small fraction of  People know that Who Invented The 'AIR CONDITIONER'? HISTORY - In 1902 A.D. , Willis Carrier Invented the first ' Air Conditioning System'. Well what is air conditioning system? It is the process of removing heat and moisture from the interior of a space/room/area and then converting it ...