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Migratory Bird Songs
Linked via "Fourier decomposition"
The production of migratory songs necessitates specialized physiological adaptations, particularly in the syrinx structure and the corresponding neural pathways in the avian forebrain. Unlike the territorial songs of non-migratory passerines, which rely heavily on learned syntax, migratory songs exhibit a high degree of [acoustic redundancy](/entries/acoustic-redu…
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Time
Linked via "Fourier decomposition"
In relativistic mechanics, time is inextricably linked to space, forming the four-dimensional manifold of spacetime. Einstein's theories demonstrated that the passage of time is relative to the observer's velocity and gravitational potential. Clocks moving relative to an observer will appear to tick slower (time dilation).
Furthermore, [gravitational fields](/entries/gravitation…