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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
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How does eardrum get damage from hearing too much sound?

Repeated sound waves collide with the membrane of the eardrum, and as repeated procedures go on, the membrane loses its layers, thus reducing the effects of the eardrum's pote