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Fact 10. Knowing how to hide from sound waves.
Suppose you are camping across the lake from another campsite. During the day, you can see them having a big party that they didn’t invite you to, but you can’t hear the music. At night, you hear all of their campfire ghost stories and conversations, even though they are so far away you couldn’t hear a party earlier. What gives? This phenomenon occurs when sound waves change direction (refract) based on temperature changes in the air. During the day, sound waves bend upward because of the cooler temperature above the ground. This creates a “Shadow Zone” where you are standing – the sound waves are basically flying over your head. Because it’s based on temperature changes, this happens in the ocean too, and submarine pilots can use “Shadow Zones” to their advantage to hide from sonar (and sea monsters).