4.1 The Importance of Thermal Noise4.2 Dealing with Probabilistic Signals4.3 Characteristics of Thermal Noise in Circuits4.4 What Happens When Noise Gets Filtered4.5 What Happens When Noise Gets Averaged4.6 Harmonizing Averaging and Filtering4.7 The All-important Signal-to-noise Ratio4.8 The Effective Number of Bits, or ENOB4.9 The RC Circuit as a Noisy System4.10 The Thermal Noise Floor in Radio ReceiversNotes