My friend
daystreet is proposing a scale for popular science presentations, to combine complexity with how likely the material is to be new to a general educated lay audience. He points out that it's easy to find introductory, intermediate, or advanced classes in Spanish or ballroom dancing, and that people taking any of those classes appreciate knowing which they are.
In the absence of such a scale, it seems that almost everything defaults to level 1, leaving people bored or frustrated because they get the same material over and over, even from different science popularizers and venues.
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In the absence of such a scale, it seems that almost everything defaults to level 1, leaving people bored or frustrated because they get the same material over and over, even from different science popularizers and venues.