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"...I want to know why this is, why some relatively few people never stop wanting answers and the rest don't care? ..."
The rest care, but life itself is more interesting than a lot of things. For many young lads, the chasing of skirts is all important, for others it is fishing. For most it is raising a family and "fitting in" with their crowd.
Most like to learn, it is just that they are interested in other things than we are; and they often take the easy way out on where to get their "learning" from. The local newspaper was never a great place to learn history for example.
And TV? Oh, Lord!