Top 10 Incredible Sound Phenomena
20 hertz to 20 kilohertz: the range of frequencies humans are able to hear. Sound is a natural constant, as essential and expected as the light we see and
Source: listverse.com
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An Optical Spy Trick Can Turn Any Shiny Object Into a Bug
Anything from a metallic Rubik’s cube to an aluminum trash can inside a room could give away your private conversations.
Source: wired.com