“ Surnames: The Chinese were among the very first cultures to adopt the use of hereditary surnames (around 2800 BC). But the custom didn't quite catch on in Europe - at least not until the Venetian aristocracy made it popular sometime between the 10th and 11th centuries AD. What culture made it popular in your setting and why?”
“ Five main ingredients were used to create this noxious, real-world (ridiculously named), chemical compound, featuring sulfur as the main ingredient. The odor was said to be akin to rotting refuse, decomposing carcasses, and fecal matter. 'Who-Me?' Was developed during WW II by the OSS to aid the French Resistance against the Germans. The idea being to utterly humiliate and ultimately demoralize the enemy by making them stink of garbage left to rot under a hot sun.
The bizarre experiment did not last long however as 'Who-Me?' could not be administered on select targets (controlled), without making everyone in a certain radius, friend, foe, and sprayer alike, stink as well”