1 Water, Water Everywhere.- 1.1 Of Time and the River: Speedboats.- 1.2 Of Time and the River: Sailing.- 1.3 Floating on the Pond.- 1.4 The Bubble in the Water Tank.- 1.5 The Bottom of the Lake.- 1.6 When Will the Puddle Evaporate?.- 2 Some "Elementary" Problems.- 2.1 When Do I Add the Cream to my Coffee?.- 2.2 The Hot-Air Balloon.- 2.3 How Far Can an Airplane Fly?.- 3 What is the Chance that ...?.- 3.1 Introduction.- 3.2 Division By 137.- 3.3 The Turbine Seals.- 3.4 The Keys to the Taxicabs.- 4 Unstable Behavior.- 4.1 Introduction.- 4.2 The Solid-Propellant Rocket.- 4.3 Boiling Water With a Hot Wire.- 4.4 A Catalytic Particle.- 5 Finding the Optimum.- 5.1 Introduction.- 5.2 Draining the Tank.- 5.3 Insulating the Electric Cable.- 5.4 Minimizing Automobile Collisions.- 5.5 Hitting a Golf Ball.- 6 Some Scientific Curiosities.- 6.1 Surface-to-Volume Ratio.- 6.2 The Leaning Tower of Pisa.- 6.3 Absolute Temperature.- 6.4 A Matter of Gravity.- 6.5 Letting Air Into an Empty Tank.- 6.6 The Two Capacitors.- 7 Violating the Laws of Thermodynamics.- 7.1 Introduction.- 7.2 Underwater Rotating Device.- 7.3 Electrolysis of Water.- 7.4 A Submarine That Needs No Fuel.- 7.5 Steam and Ethylene Glycol.- 7.6 An Odd Case of Radiative Exchange.- 8 Some Propagation Processes.- 8.1 A Weak Shock Wave.- 8.2 Melting Through Ice.- 8.3 Combustion Wave in a Thermite Mixture.- 8.4 Flame Propagation in a Combustible Gas.- 9 A Lecture on Dimensionless Groups.- 9.1 Mach Number.- 9.2 Froude Number.- 9.3 Reynolds Number.- 9.4 Grashof Number.- 9.5 Euler Number and Bernoulli Equation.- 9.6 Barometric Formula.- 9.7 Weber Number.- 9.8 Other Dimensionless Numbers.