This happened just 10 minutes ago. I just started to hear a deep hum. I googled it, and turns out to be a world wide phenomenon. I've heard of it, but i never got to know how one starts hearing it. I just started to hear a deep(or usually reffered to as a low frequency) hum out of nowhere. I was in my room, preparing to go to bed, and then this big hum comes to me. It is now a little less loud than for 10 minutes ago, but my question is: will it dissapear?