[ancarda]

Off-topic: how did you format that equation (K = mv^2/2) so nicely? e.g. mv is in italics. It looks really nice.

Does Hacker News have built in LaTeX, or is that just very clever use of Unicode?

[Recursing]

Seems to be just unicode in a code block. mv is 𝑚𝑣

[acqq]

And the verbatim lines are explained here:

https://news.ycombinator.com/formatdoc

[abrowne]

And two black squares on Firefox beta on my Android 5.1 phone.

[barrkel]

Works fine in Firefox Beta (and normal Firefox) on my Android 8 phone.

[abrowne]

OK, so fixed in up-to-date Android or with a better vendor (mine is TCL [Alcatel branded]).