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A 2001 study in the American Journal of Botany titled 'Oscillation frequencies of tapered plant stems.' examined the phenomenon of plants that appear to sway on their own.
The key, it found, was extremely weak winds that are imperceptible to humans, but magnify oscillations in the plant, making it appear to move for no reason.
'Free oscillations of upright plant stems, or in technical terms, slender tapered rods with one end free, can be described by considering the equilibrium between bending moments in the form of a differential equation with appropriate boundary conditions,' the researchers Hanns-Christof Spatz and Olga Speck wrote, before analysing the forces needed to the bizarre phenomenon.
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originally posted by: gottaknow
Ok - this does weird me out a bit.
Mostly because there are OTHER videos of the same thing. One in particular that is clearly moving in such a way that it cannot be happening from a creature in the ground below it.
There are others too. At this point, I'm just thinking (assuming these aren't all hoaxes) that there might be some reflexive, genetic factor that upon some certain stage of maturation causes this kind of dancing movement to further help spread it's spores. Still, if that's the case, then plants just got that more interesting.