[NonHyloMorph]

Might want to do yourself a favor and figure out the implied question behind 400(?) It's... not a lot of work. At least for me personally it rubs me the wrong way to name an important metric in Fahrenheit and then to give an estimate with a question mark for the proper SI unit.

[roarcher]

Looks to me like the author wrote themselves an inline note and forgot to remove it before publishing.

[moebrowne]

I'd assumed that the question mark was supposed to be a degrees (°) symbol but got mangled somehow. 752F is exactly 400C