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!
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.