The Tao Hum Even though science, technology, and research have come a very long way but there are many unsolved mysteries till date, So today i bring you another of the world's greatest unsolved mysteries 'Tao Hum.' In the small town of Taos, New Mexico, There is a certain buzz often heard on the horizon that can be compared to the sound of a distant diesel engine. Although the sound can be heard by the naked ear, various sound detection devices are not able to pick up the hum. This is known as the Taos Hum and up to this day, no one still knows how this sound is being created. - See more at: http://www.duketundesblog.com/2015/09/saturday-digest-worlds-greatest.html