Telephone

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The document discusses the telephone and its inventor Alexander Graham Bell. Bell improved upon the telegraph and invented the telephone, which uses electricity to transmit sound over a distance. The telephone allows people to communicate by talking to each other from different locations.

Education Business Technology

This document discusses twist-averaged boundary conditions for calculating the properties of layered materials with a twist. It introduces the twist angle parameters θx, θy, θz and reciprocal lattice vectors k and G. It also discusses how the wavefunction and energy bands are affected by the twist and reciprocal lattice vectors. It then presents an approach for calculating the density matrix with a fixed phase between slices, and shows that this results in an effective potential that depends on the twist angles and reciprocal lattice vectors.

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3. Telegraph, Telephone He improved this.

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