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Previous research shows that "concert tremor" can be recorded as long-duration signals with narrowband, harmonic frequency peaks between 1 and 10 hertz.

In a study of mice, they found that daily exposure to light and sound with a frequency of 40 hertz protected brain cells from chemotherapy-induced damage.

It also operates at frequencies greater than 100 hertz, achieves displacements of 140% and can lift 22 times its body weight.

In contrast, the researchers involved in this work were looking for a collective hum at much lower frequencies — one-billionth of one hertz, far below the audible range — emanating from everywhere all at once.

The infinitesimal expansion and contraction occurs at a frequency of about 10 to 100 hertz and creates a measurable offset between one beam and its perpendicular twin.