This family contains buckwheat, sorrel (but not wood sorrel[?]), rhubarb, and knotgrass[?]. It is named for the shape of the seed; that of rhubarb, for example, has a triangular cross-section.
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... takes a while until one finds the "rolling" point, but the gyro will also be accelerated to a smaller extent by the slipping friction.
The device is covered ...