Hai again! What’s a tedious thing you’ve had to explain?

Question: Hai again! What's a tedious thing you've had to explain?
- Keywords:
  explain,
  tedious
Asked by anon-210416 to Tori on 13 Mar 2019.
- Tori Blakeman answered on 13 Mar 2019:
  
  Probably environmental DNA (eDNA) – see here in an article I wrote when I worked for Imperial College communications – http://www.imperial.ac.uk/news/181289/fishing-dna-during-breeding-season-could/

Question: Hai again! What's a tedious thing you've had to explain?