Summary of The hidden background noise that can catch criminals

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This YouTube video discusses how background noise can be used to help catch criminals. This is done through the use of technology that was only possible a few decades ago. The video explains how the mains hum created by alternating current running through power lines can be used to identify the location of a crime.

• 00:00:00 The alternating current running through power lines can create vibrations that make sound at a frequency of 50 hertz. This "mains hum" can be annoying for people recording audio, but can also be used as evidence in court if the grid frequency is known.
• 00:05:00 This YouTube video discusses how background noise can be used to help catch criminals. This is done through the use of technology that was only possible a few decades ago.