Why is there always the sound of marbles falling to the floor upstairs in the middle of the night?

I don't know if you have ever encountered such a thing. In the dead of night, when you are about to fall asleep, you suddenly hear the sound of marbles falling to the ground from upstairs, and you wake up immediately! I wondered whose child would play marbles upstairs in the middle of the night? Where did this sound come from? Today, let's take you to find out.

It turns out that the marbles sound on the ceiling at night may be caused by the following situations:

The first is thermal expansion and contraction. During the day, the building absorbs the heat as the temperature rises, and at night, the temperature of the gaps between the pipes in the building suddenly drops. This alternating heat and cold causes the concrete, cement, and steel bars inside to expand and contract. When some building materials shrink, they make a sound similar to that of glass beads falling to the ground.

Then there is mold, which has a strong taste and likes to "eat" building materials and cement. There is a pipeline outlet for the electric light circuit at the lower layer of the ceiling, where the temperature and air are suitable for the survival of mold. It will invade the gaps in the cement along the hole, and then begin to erode around to form a hollow pipe. When the surrounding cement is eroded to a certain extent, the steel bars will bounce back and forth in the hollow pipe, producing a marble sound.

After reading this, do you know where the sound comes from? It won’t be so scary when you hear it next time!

Author | Science Popularization China New Media

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