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When you live in a complex world, you have to simplify it in order to understand it. Indeed, that’s what ’understand’ means.
Another, more serious example is the question ’Is the solar system stable?’, which means ’Could it change dramatically as a result of some tiny disturbance?’ In 1887 King Oscar II of Sweden offered a prize of 2,500 crowns for the answer It took about a century for the world’s mathematicians to come up with a definite answer: ’Maybe’.
But... whenever a scientist says ’there is no scientific evidence for’, there are three important questions you should ask -especially if it’s a government scientist. These are: ’Is there any evidence against?, ’Has anyone looked?’, and ’If they did, would they expect to find anything?’