Our panel of 91 professional philosophers has responded to

2
 questions about 
Culture
5
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Euthanasia
24
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80
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134
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374
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81
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154
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218
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124
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77
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54
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88
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4
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58
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58
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208
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282
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244
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75
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110
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89
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68
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67
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23
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32
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151
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Existence
1280
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51
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110
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221
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170
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34
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287
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43
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2
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574
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75
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96
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70
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69
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31
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117
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105
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392
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27
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36
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Literature
284
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Mind
39
 questions about 
Race

Question of the Day

When I was a young man, I knew someone who was, in the phrase that might have been used at that time, "mildly retarded." He was married. And he understood his condition. And he struck me as a happy man. He certainly wasn't leading a life of misery.

In the neighborhood where I now live, there is a young man who is even more intellectually challenged. I doubt that he understands his condition. But he does not strike me as unhappy at all. To be sure, he lives a simple life. And no: he couldn't live on his own. And he also won't have "accomplishments" in the sense you have in mind. But near as I can tell, he's not miserable at all. He's happy. In his case, I don't think marriage is an issue. But the larger point is the important one: intellectual ability and happiness are quite different things. There are sad, miserable geniuses and thriving, happy people whose IQ scores are well below 100.

So what I'm saying is that I don't accept the premise of your question.