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This lecture covers topics related to noise and measurements, including electronic noise, thermomechanical noise, amplifier noise, and frequency noise. It explains the concept of noise as fluctuations in a parameter, the power spectral density, and the Johnson-Nyquist noise. The lecture also delves into the calibration of amplitude using thermomechanical noise, the limitations of detection, and different ways to track frequency in systems. Additionally, it discusses the role of resonators and oscillators, the fluctuation-dissipation theorem, and the impact of nonlinearity on system limits.