158 Interesting Things - S O U N D

The speed and the physical characteristics of sound vary with the change in its ambient conditions. Our ears are capable of hearing sound waves which lie in the range between 20 and 20,000 vibrations per second. Sound waves travel through solid matter, such as iron, stone, and steel, must faster than it moves through the air. Let's find out more!


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159 Interesting Things - The Ozarks and the Blue Man

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157 Interesting Things - Whistling Village of KongThong