DID YOU KNOW | No148
DID YOU KNOW | No148: Sitting close to loudspeakers at concerts (which can reach about 120 decibels) can cause a temporary threshold shift or cause permanent damage to your hearing in just 7.5 seconds!
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DID YOU KNOW | No 87
DID YOU KNOW | No 87: People who use hearing aids have improved social lives.
DID YOU KNOW | No 56
DID YOU KNOW | No 56: Harmonic middle C on a piano, for example sounds different to middle C on a guitar due to the harmonics. The fundamental frequency of C = 256 Hz is the same.