Spent the last two days in Lubbock TX at Texas Tech. Gave the Physics Colloquium there and then a public talk. My public talk had several deficiencies: (1) it did not have any video of structure formation and galaxy merging, (2) it did not get across just how "empty" and transparent galaxies are, and (3) it did not get across the two somewhat contradictory ideas that (a) dark matter is hypothetical, but at the same time, (b) our evidence for it is very strong.
David- the next time you do the presentation, may I suggest that in addition to video of structure formation and galaxy merging, you incorporate pop-ups? They totally reel the viewer in, plus you can make jokes at the galaxies' expense without interfering with the overall formation/merging narrative.
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