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physics class disguised as a playground duel, where weight is destiny and friends are leverage

means A long plank balanced at its center on which two people sit at opposite ends, rising and falling in turns as each pushes off the ground.

from A reduplication — the kind of rhyming sing-song doubling that English loves (zigzag, flip-flop, criss-cross). The favored explanation traces it to the rhythmic chant of sawyers working a two-man saw back and forth, the 'see-saw' of the blade matching the up-and-down of the play; whether the children's plank truly borrowed the sawyers' work-song or simply echoes the same swaying motion is hard to pin down, but the toy and the phrase both surface in English by around the 17th century.

old name
called a teeter-totter across much of America
hidden math
a working lever balancing torque around a fixed point
power move
the heavier kid controls everything from the bottom
betrayal classic
hopping off mid-air sends partners crashing down
latin roots
name echoes the rhythmic chant of sawyers cutting wood
for instance

seesaw bridge in amsterdam — functional bridge in de pijp neighborhood that tilts up and down with weight

seesaw at meiji shrine — historic playground equipment in tokyo where japanese children play daily

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