As the brain ages, a number of changes occur, including shrinkage and reductions in cell activity, which can impact on performance. It has long been thought that activities which keep the brain active, such as crossword puzzles, may help minimise the impact — and the latest study suggests that surfing the web can be added to the list.
...finally, I can now plan for how I will spend my retirement."
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I would personally assume that the Adam and Eve story is also mythology for reasons similar to what you mention: nothing about the story is actually asking me to take it literally, and it doesn't seem to match our best historical records. So yeah, a literalist hermeneutic has all sorts of problems, and not just in Genesis. This is why most branches of Christianity, save the pronounced post-pietist and conservative Anabaptist movements, do not maintain this hermeneutical approach.
As C. S. Lewis famously stated, and I paraphrase, "Christianity is a myth that is true." To equate myth with fiction due to a binary view on the role of language as conveying either truths or errors seems to be a lazy application of reason. This is where fundamentalists thrive; that is indeed their worldview. It should be rejected by all persons because it is not very unintelligent. By that I mean not well equipped for understanding the world around us.