4 ms·

I've presented two direct quotes from the 1950s saying the reason for switching to "chalkboard" is because the new boards were not black. There's an old sa

I've presented two direct quotes from the 1950s saying the reason for switching to "chalkboard" is because the new boards were not black. There's an old saying: "One swallow does not make a summer". It means that one should be careful extrapolating from slight evidence. So how does your pet theory handle that the same phenomenon, a shift from blackboard to chalkboard, also happened in the UK (which also had a period of co-incident racial tension, albeit not as extreme as in the US) while, as others have mentioned, green blackboards are rare?

eesmith 4y ago
My point was to demonstrate that your "hypersensitivity" hypothesis has no evidentiary basis, and in fact runs counter to easily available evidence. I believe I have done that, in way that other HN readers can easily verify for themselves. Had you researched the topic yourself you would find more supporting evidence for my pet theory. I only presented a sampling of what I found, to keep my comment from being a wall of text. Your saying doesn't even apply to you as you have not presented any evidence, not even a single feather. As you don't seem to care, my interest here is done.