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What is the marble dropping sound you hear in your walls or from the apartment above you this is the second DC apartment you have heard it in and apparently people in Singapore hear this too?

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Water hammer occurs when water flow is shut off suddenly like when the toilet is flushed. This change in pressure rattles the piping and create 'clanging'sounds, which may sound like marbles dropping after distortion through concrete walls. :)
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How do people hear sound?

The humans hear sounds using their ears. When sound waves enter the  ear they go through a process making the sound waves translated  from vibrations to meaningful explanati

How does the ear hear sound through a wall?

your ear hears sounds through a wall because of basic physics. when a noise is made, the air particles move. the particles then transfer the engery they received onto another

Can people hear all sounds?

No. There is a frequency range in which people can hear. Very high frequency or low frequency sounds are inaudible to us, but can be heard by some other creatures, like dogs f

How can people hear sounds?

  Sound waves hit the eardrum and cause it to vibrate, those vibrations travel through the inner ear through a series of small bones and nerve endings that send those sign

How people hear sounds?

I have no idea who answered this question I don't know who would search for it. But I'll tell the answer anyways even though everybody knows is by their ear.