Theres nothing as secure, Thanga said, adding that it serves as an insurance policy in the event of global catastrophe. But I think the same complexity is what makes them beautiful, he said. Infrasound, also known as low-frequency sound, describes sound waves with a frequency below the lower limit of human audibility. Its not crazy big, Thanga insisted. It covers sounds below 20 Hz and down as far as 0.001 Hz.
That is not the name of the research and letters journal.
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