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I just completely revised a surprisingly popular one of my lists, The Best Sites For Teaching About Latitude & Longitude.
I deleted several old links and added a whole bunch of new ones. Feel free to make additional suggestions.
David Sousa in his book “How The Brain Learns” talks about teaching longitude and latitude and other concepts that shared a lot of similarities, like mitosis and meiosis or simile and metaphor. With concepts like this there is high risk that the learner cannot tell them apart because the similarities outweigh the differences which results in the learner attaching the same retrieval cues to both concepts. Later, when trying to recall the information it could produce both concepts.
He goes on to explain that when two concepts have more similarities than differences one should teach the two concepts at different times. Pick one concept and teach it until the students have it down and can recall it from long-term memory. Then move onto a different topic for a few weeks and when you come back to the other concept, teach the differences. This way the first concept acts as positive transfer for the second, similar, concept.
Another way he explains is to teach the differences, but this usually only works for older learners.
Just a thought!