Unexplained
10 Most Bizarre Sounds You’d Not have Heard
For humans, hearing is normally limited to frequencies between about 12 Hz and 20,000 Hz (20 kHz), although these limits are not definite. Here we mention 10 sounds that are in some way or another bizarre and you might not have listened to them before or you might have listened but interpreted differently. 10.
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Piramidy
Mu is the name of a fictional continent that was once believed to have existed in one of Earth 's oceans , but disappeared at the dawn of human history .
Mu (lost continent)
