Skeptic or Sceptic?
"Why do you spell skeptic with a 'K' when the English version is spelt with a 'C'"? is a frequent query.
Well the fact that (British) people notice and remember is one reason!
Skeptics in the USA, and in many other countries throughout the world, have a stronger identity than we have here in the UK thanks to the input of James Randi, Michael Shermer, and Stephen Barrett, to name but a few. Spelling skeptic the same way as they do helps with continuity, as the skeptic community is a world-wide one.
Also, using skeptic rather than sceptic, helps with search engine results as the vast majority of people searching use the American spelling.
The issue is not an important one as both spellings of the word mean exactly the same thing. Some people, however, do try to make a distinction between the two spellings as if they have different meanings: they do not.
The biggest confusion that occurs is where people look up sceptic/skeptic in the dictionary and get the definition of the noun: One who instinctively or habitually doubts, questions, or disagrees with assertions or generally accepted conclusions.
To be "a Skeptic" means that the person adheres to the method of scientific skepticism. This is different to being "sceptical" which means to be doubtful.
