Have you ever noticed the iconic sound of a bomb falling during World War 2 movies? You might think that spine-chilling noise is from the bomb slicing through the air, but that's actually not true. In fact, the sound we often hear in movies isn't quite accurate. Because from the ground's perspective, it's actually the opposite. This unique sound was caused by whistles attached to some bombs to weaken the enemy's morale and create panic on the ground.

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