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This toy uses the principles of center of mass to keep balance when sitting on a finger. In physics, the center of mass of a distribution of mass in space (sometimes referred to as the barycenter or balance point) is the unique point at any given time where the weighted relative position of the distributed mass sums to zero.
Lê Trọng Tấn when still was young. Lê Trọng Tấn was born on 1 October 1914 [1] as Lê Trọng Tố (Vietnamese pronunciation: [le˧˧ t͡ɕawŋ͡m˧˨ʔ to˧˦]), his father was a scholar who once participated in the Tonkin Free School movement before retiring in the village Yên Nghĩa, Hoài Đức [2] and died when Lê Trọng Tố was 7 years old. [3]