Correction
On the capitalization of Audi's quattro in our Nuvolari coverage.
An earlier version of our Nuvolari coverage capitalized Audi's all-wheel drive as "Quattro." Audi styles it quattro, lowercase, the one proper name the company declines to grant a capital. A small letter is not a small thing. It is the maker's own house rule, ours to observe and not to overrule. The record is corrected.