What's with the manger?

Mainly because the sound of horses barking and weapons colliding is echoed here all the year round, and it was also the battlefield of Shu Army and Na Man 1800 years ago, so the villagers here all thought it was a "Yin soldier corridor", but later scientists discovered that it was only an acoustic phenomenon. When the wind blowing into the manger is very strong, it will collide with the rock wall, producing the sound and reflection effect.

Cao, Ma Jing is a mysterious valley, located in Shalin Scenic Area, luliang county, Yunnan. There are similar weapons collisions or war horses howling here all the year round, and this is exactly the place where Zhuge Liang fought the barbarian army 1800 years ago, so under normal circumstances, local villagers are afraid to go near here. When passing by, most villagers will kneel and kowtow before they dare to cross.

Extended data:

The amazing phenomenon of surprised manger quickly attracted the attention of scientists and began to investigate it. First of all, it was found that most of the rocks here were quartzite, and a small amount of magnetite was found after detection. So experts think it is probably because quartzite contains a lot of silicon dioxide, and silicon dioxide has quite good conductivity.

Magnetite, on the other hand, can preserve sound, which means that the sound of 1800 years ago is probably recorded. However, experts quickly overturned this speculation, because the amount of magnetite here was not enough to achieve the record effect, and then they found that the sound would become stronger in thunderstorm weather.

At this time, lightning and magnetic field are naturally associated, which may enhance the recording effect of magnetite. But in fact, the sound of ancient battlefields was mostly in the sixties and seventies, and it was difficult to exceed 90 decibels. At this time, there is no way to preserve them for a long time. After studying the geographical structure of the manger, I suddenly found that it was like a bottle mouth with straight sides up and down.

The entrance is small, but the wind is strong. Just like when we blow our mouths with wine bottles, we can make a loud whistle. The reflection of sound in a narrow space will repeatedly bring vibration and amplify the original tiny sound several times. And the screams of horses and weapons on these battlefields are also caused by the wind and the geographical location here.

Baidu Encyclopedia-Scared Horse Trough