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porphyrin
  • Member for 8 years, 2 months
  • Last seen this week
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461
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About

I'm a semi-retired physical chemist.

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2
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4
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17
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10
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4
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17
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9
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6
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26
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6
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3
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13
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6
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2
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9
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6
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2
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9
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