To reduce duplications (with the same topic being discussed in 4 forums) I'm posting this topic in two forums -- Elementary Science, General Science and Teaching -- and telling two other forums (Informal Science, Physical Science) so, if you're interested, you can go to the other forums and participate, or just view the discussion(s) that I'm hoping will happen.
Craig Rusbulthttps://educationforproblemsolving.net/
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