Terrifying truth behind mysterious sound that only '2% of people' can hear as man simulates it

There is an odd phenomenon that has stumped scientists for decades and funnily enough only a small portion of the population can actually hear the bizarre sound.

While humming loudly is something you do to annoy your younger siblings or co-workers, ‘The Hum’ is a weird phenomenon that has been heard around the world.

Well, not heard by everyone, because only an estimated two to four percent of people can actually hear it in the first place.

The phenomenon has been reported across the world and dates back to as early as the 1970s, possibly earlier, and has been heard in countries across the world including the US, Australia and the UK.

But what is it? Well, it is what the name suggests, a weird and dull hum, that doesn’t seem to have a point of origin, according to those who have reported it.

Experts have attempted to know what the origin of the hum is (Benn Jordan/YouTube)

While there have been many theories, none have so far proven to be conclusive and able to explain why the phenomenon can be heard all over the world.

Musician and acoustic scientist Benn Jordan made a YouTube video reflecting on it, even offering up a theory and recreating it on a smaller scale.

Jordan explained that in the town of Taos in New Mexico in the 1990s, an estimated 11 percent of the population heard the hum, making it more famous than it had been previously.

Some residents allegedly found the sound so flustering that they chose to move out as a result.

Jordan noted that conspiracy theories would quickly follow as a result of the reinvigorated fascination of the phenomenon and ultimately reinforce a concerning truth, that we don’t exactly know what is causing it. But the musician has a theory which he thinks is pretty solid.

He said: “Here is my big theory: high pressure natural gas pipelines are packed with as much as 1,500 pounds per square inch of internal pressure.

“The gas travels long distances through these pipelines using pressure differentials between compressor stations.

“This pressure is typically spinning around the edges away from the centre, not only could that centrifugal pressure oscillate the pipe itself but it heats up the molecules so much that coolers are needed down stream from the compressors.”

Jordan then proceeded to conduct an experiment of how this would work, using a Rijke tube and it is easy to see why some of his viewers think Jordan has cracked the enigma.

He explained by heating up some metal screens within the pipe, he is able to show what sound is made when you ‘drastically change’ the temperature and pressure differential inside of a pipe.

Loe and behold, the pipe began making an eerie sounding hum and Jordan asked how much louder the sound would be if it was to scale.

But if you don’t like Jordan’s theory, you could just conclude it is aliens and call it a day.