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The bulk of your philosophy of our life is formed within the first seven a lot of your childhood. Then you have another influential period involving the mid teens in the early twenties. From that point on most people make little change until they are 40 or 50 plus when many people will begin to reassess their philosophy. When tractors were first developed, they used enormous steam engines that were notoriously unreliable and hard to maintain. These were phased out around the turn with the twentieth century and substituted for internal combustion engines which were smaller though powerful and ran on a number of fuels including kerosene, ethanol and gasoline. By the 1960s several of these engines were phased out and only more effective internal combustion engines that ran on diesel and after this, biodiesel.