I was shocked by your "people remember 20% of what they read vs 80% of what they see" statistic. I followed chain of sources, which led to a broken hp page [1]. It looks like HP pulled this number out of their ass [2]. Making a claim without a source is one thing; making a claim with a false source is another. This sort of practice is very damaging to the authenticity of information on the internet.

[1] https://web.archive.org/web/20111117203151/http://www.hp.com...

[2] https://policyviz.com/2015/10/21/more-statistical-fallacies/