1. When (time wise in history) did some people first start hiding their Peyos behind their ears?
2. Is it a fact that the reason was due to antisemitism? And was it pikuach nefesh? Even without noticeable Peyos a Jew can be identified as a Jew. When have we ever, in all of history, hidden that we are Jews?!
3. What is the reason some people curl their Peyos?
4. Why do some wear their Peyos over their head/under their Yarmulka, coming out on the other side of their face?
5. How long should the Peyos *ideally* be, not considering antisemitism or other external/non-halachic factors?
6. What is the reason some people have *no* Peyos hanging from their sides (i.e. not even hidden behind the ear)?