I skip-read through Unicode explained (Jukka K. Korpela, O'Reilly, First edition June 2006) during the last few weeks. While I found the book overall quite boring I still learned a few things, among them most importantly three things I'd like to share with you:

• Unicode does not contain a code point for every known character
• The Unicode space is 21 bits large
• Therefore UTF-8, UTF-16 and UTF-32 can all express the full character set of Unicode