Written in 1886, Sir Arthur Conan Doyle’s first story featuring Sherlock Holmes marks the first
appearance of the great detective and his famous home located at 221B Baker Street.
“It is a capital mistake to theorize before one has data”, Sherlock Holmes said. In the past, “data”
was sometimes a synonym for “fact”, with the definition being: a collection of facts from which
conclusions may be drawn. Nowadays, the importance of data in the computer world has enriched the
meaning of this word. However, the mission of data has not changed: to record facts faithfully and
therefore to help us think.