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This lecture covers experimental techniques for studying short-range correlations in materials, focusing on specific heat measurements and electron spin resonance. It discusses the Mermin-Wagner-Berezinskii theorem, 1D and 2D systems, and the zero-point entropy in 'spin ice'. The slides present data on specific heat, magnetic properties, and phase transitions in materials like Dy₂TI₂O and Ho₂Ti₂O.