Thanks! When I was a kid, I remember I figured out how to change the font in Windows and I spent a long time messing around with it and settled on Comic Sans MS. Turns out I also have mild dyslexia, so might be part of why I like it!

Tough question! On the one hand, I've never been misled by a markdown document, but on the other hand, it's the new kid on the block, and doesn't have anywhere near the same amount of traction as .txt, the academic distinction of .tex, nor the clout of .xlsx. As an aside, I think Randall overvalues PDF here. I think I'd put .md just above .doc, but below .xlsx.