TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The fuel flowpath comprises an anode flowpath configured to route the fuel through at least a portion of the fuel cell. The oxygen flowpath comprises a cathode flowpath configured to route oxygen through at least a portion of the fuel cell. The electrochemical catalytic reaction cell comprises an anode in fluid communication with the anode flowpath, and upon which a catalytic reaction with the fuel is configured to take place; a cathode in fluid communication with the cathode flowpath and upon which a catalytic reaction with oxygen is configured to take place; and a membrane disposed between the anode and cathode, such that electrolyte communication is established between them during operation of the fuel cell. The fuel cell comprises a recirculation assembly (16) comprising a recirculation flowpath, a pump (18, 34), and a radiator (20). The coolant isolation manifold includes an inlet and an outlet. The recirculation flowpath fluidly connects the coolant isolation manifold inlet and outlet.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The vegetable oil-based dielectric fluid comprises vegetable oil(s); and fatty acid molecule(s) that include a degree(s) of unsaturation. It comprises a blend of at least 2 vegetable oils or a blend of vegetable oil(s) and synthetic oil(s), preferably a petroleum-derived mineral oil. The vegetable oil-based dielectric fluid is free of chlorinated compounds. It is food grade. It comprises monounsaturated fatty acids, polyunsaturated fatty acids, and/or saturated fatty acids. It comprises an edible seed-based ester including fatty acid triglycerides comprising a linear chain of between 14-22C atoms and between 0-3 double bonds; vegetable oil from castor oil, coconut oil, corn oil, cottonseed oil, crambie oil, jojoba oil, lesquerella oil, linseed oil, olive oil, palm oil, canola oil, safflower oil, sunflower oil, soya oil, and/or veronia oil; an antioxidant compound from butylated hydroanisole, butylated hydrotoluene, tertiary butylhydroquinone, tetrahydrobutrophenone, ascorbyl palmitate, propyl gallate, alpha-, beta-, and/or DELTA-tocopherol; antimicrobial substance; a dye or pigment, which is oil soluble; and a pour point depressant consisting of polyvinyl acetate oligomers and polymers and/or acrylic oligomers and polymers.Preferred Composition: The vegetable oil-based dielectric fluid comprises a blend of vegetable oil(s) and petroleum-derived mineral oil (not more than 50, preferably not more than 20 wt.%). It comprises vegetable oil (98.5%).Preferred Compound: The vegetable oil-based dielectric fluid comprises a triglyceride of formula R1-C(=O)-O-CH2-CH(-O-C(=O)-R2)-CH2-O-C(=O)-R3.R1-R3 = alkyl or alkenyl group.The alkyl group comprises straight-chained or branched alkyl groups, optionally saturated alkyl groups, and/or optionally substituted alkyl groups. The alkenyl group comprises straight-chained or branched alkenyl groups, optionally saturated alkenyl groups, and/or optionally substituted alkenyl groups. The fatty acid molecule(s) is myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, arachidic acid, eicosenoic acid, behenic acid, erucic acid, palmitoleic acid, docosadienoic acid, lignoceric acid, tetracosenoic acid, margaric acid, margaroleic acid, gadoleic acid, caprylic acid, capric acid, lauric acid, pentadecanoic acid, and/or heptadecanoic acid.Preferred Property: The vegetable oil-based dielectric fluid has a heat capacity of at least 0.3 cal/gdegreesC, 2.39 J/g/K at 100degreesC, or 2.10 J/g/K at 50degreesC; a thermal conductivity of up to and including 4.0 x 10-4 cal/(cm.sdegreesC) at 25degreesC; a boiling point of at least 330degreesC; a flash point of at least 300degreesC; a fire point of at least 340degreesC; pour point of at most -20degreesC; a coefficient of expansion of 7.4 x 10-4/oC at 25degreesC; a dielectric strength of at least 30 kV/100 mil gap; a dielectric constant of 3.2 at 25degreesC; a dissipation factor of at most 0.05% at 25degreesC; a volume resistivity of 30 x 1012 OMEGA-cm at 25degreesC; a break down potential of at least 47 kV at 25degreesC; an impulse strength of 226 kV; a gassing tendency of -79 mul/minute; a specific gravity of 0.92 at 25degreesC; an interfacial tension of at least 20 mN/m at 25degreesC; a pH of 5.8; a neutralization number of at most 0.07 mg potassium hydroxide/g; vapor pressure of at most 0.01 mm mercury at 20degreesC; a solubility in water of at most 0.1%; a viscosity of between 2-15 or at most 9 cSt at 100degreesC, at most 110, preferably at most 40 cSt at 40degreesC; a moisture content of at most 200 ppm; percent saturation of moisture of between 5-10, preferably between 1-2%; an air solubility of 16% at 25degreesC at 1 atm; a biochemical oxygen demand to chemical oxygen demand ratio of 45%; a 5-day biochemical oxygen demand of at least 200 ppm; a 21-day biodegradation rate of at least99%; and median lethal concentration (LC50) of at most 250 mg/L. The vegetable oil-based dielectric fluid comprises volatile organic compounds (at most 0.001 g/L).