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DJohnM

Retired community college professor

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  • Toronto, Canada
  • Member for 6 years, 3 months
  • 12 profile views
  • Last seen Aug 18 at 16:06

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Top posts (3) All Questions Answers | Votes Newest

17 Mystery of the many-loaded muzzles Jan 23 '15
3 How did ancient empires account for slow propagation of information e.g. in their legal codes? Oct 28 '13
1 When did we find out time of day changes with longitude? Mar 21 '17

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