NOVELTY - Making a farnesene interpolymer comprises: either copolymerizing a farnesene and at least one vinyl monomer in the presence of a catalyst, where the farnesene is present at greater than 20 mole%, the farnesene is alpha -farnesene and/or beta -farnesene, and the vinyl monomer does not comprise a terpene; or making a farnesene from a simple sugar by a microorganism, and copolymerizing the farnesene and the vinyl monomer in the presence of a catalyst.    USE - The method is useful for making a farnesene interpolymer, which is useful in an article comprising a molded article, film, sheet or foam, where the molded article comprises toys, grips, soft touch handles, bumper rub strips, floorings, auto floor mats, wheels, casters, furniture and appliance feet, tags, seals, gaskets, automotive doors, bumper fascia, grill components, rocker panels, hoses, linings, office supplies, seals, liners, diaphragms, tubes, lids, stoppers, plunger tips, delivery systems, kitchen wares, shoes, shoe bladders, or shoe soles (all claimed). The farnesene interpolymer is useful: for wire and cable coating operations; in sheet extrusion for vacuum forming operations; and in various fields such as automotive, construction, medical, food and beverage, electrical, appliance, business machine, and consumer markets.    ADVANTAGE - The method provides farnesene interpolymer that have unique physical, chemical and biological properties in an environmentally friendly manner.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a farnesene interpolymer prepared by the method, where the farnesene interpolymer comprises one or more polymer molecules having a structure of formula (-(X)n-(Y1)m-); and    (2) a polymer composition comprising the farnesene interpolymer.    n, m = 1-100000;    X = derived from a farnesene and having one or more of (-CH2-C(-R1)=CH-CH2-), (-CH2-C(-R1)=CH-CH2-), (-C(-R1)(-CH=CH2)-CH2-), (-CH(-R2)-CH2-), (-CH(-R3)-C(-CH3)=CH-CH2-), (-CH(-R3)-C(-CH3)=CH-CH2-), (-CH(-R3)-C(-CH3)(-CH=CH2)-) or (-CH(-R4)-CH2-);    Y1 = (-C(-R5)(-R7)-C(-R6)(-R8)-);    R1 = ((3E)-4,8-dimethylnona-3,7-dienyl);    R2 = ((4E)-5,9-dimethyl-1-methylene-deca-4,8-dienyl);    R3 = ((2E)-3,7-dimethylocta-2,6-dienyl);    R4 = ((1Z,4E)-1,5,9-trimethyldeca-1,4,8-trienyl); and    R5-R8 = hydrocarbyl, heterocyclyl (both optionally substituted), H or functional group comprising O, N, S or P, where none of R5-R8 is or comprises alkenyl, cycloalkenyl or alkynyl, and the hydrocarbyl is alkyl or aryl.