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Often referred to as molecular vibrations, the motion of atoms act like tiny springs, undergoing periodic motion.

Astronomers detected these ghostly pirouettes by analyzing exquisitely precise data from the Gaia satellite, revealing the partner star’s periodic motion.

For a flexible object under just the right circumstances, this cycle may persist, resulting in a potentially violent periodic motion.

They correlated the periodic motions of celestial objects with human history and, rather than seeking a physical explanation for their astronomical data, they used it to initiate wars or rituals such as human sacrifice.

Pi appears most often in formulas involving circles or periodic motion, and it infiltrates some fundamental physical constants.