• art
  • bears, deers
  • biology
  • cinema
  • dead languages
  • english, french, german, greek, italian, russian, polish, etc.
  • history
  • human body
  • human brain
  • human mind
  • icelandic language
  • literature
  • marine animals
  • moon
  • philosophy
  • planets
  • quantum science
  • stars
  • the history of each country
  • the origin of the universe
  • what we are made of
feb 12 2013 ∞
aug 11 2014 +