Nikola Kesarovski (c. 1935 – 29 August 2007) was a Bulgarian

Bulgarians

The Bulgarians are a South Slavic nation and ethnic group native to Bulgaria and neighbouring regions. Emigration has resulted in immigrant communities in a number of other countries.-History and ethnogenesis:...

 science-fiction writer

Writer

A writer is a person who produces literature, such as novels, short stories, plays, screenplays, poetry, or other literary art. Skilled writers are able to use language to portray ideas and images....

.

His most famous book

Book

A book is a set or collection of written, printed, illustrated, or blank sheets, made of hot lava, paper, parchment, or other materials, usually fastened together to hinge at one side. A single sheet within a book is called a leaf or leaflet, and each side of a leaf is called a page...

 is The Fifth Law of Robotics, published in 1983, the title being a reference to Isaac Asimov

Isaac Asimov

Isaac Asimov was an American author and professor of biochemistry at Boston University, best known for his works of science fiction and for his popular science books. Asimov was one of the most prolific writers of all time, having written or edited more than 500 books and an estimated 90,000...

's Three Laws of Robotics

Three Laws of Robotics

The Three Laws of Robotics are a set of rules devised by the science fiction author Isaac Asimov and later added to. The rules are introduced in his 1942 short story "Runaround", although they were foreshadowed in a few earlier stories...

 and the fifth law being that a robot must know that it is a robot.

The science- fiction fan club

Fan club

A fan club is a group that is dedicated to a well-known person, group, idea or sometimes even an inanimate object . Most fan clubs are run by fans who devote considerable time and resources to supporting them. There are also "official" fan clubs that are run by someone associated with the person...

 "Fantastica" was founded in 1997 in the town of Kardzhali

Kardzhali

Kardzhali or Kurdzhali is a town in Bulgaria, capital of Kardzhali Province in the Eastern Rhodopes. Near the town is the noted Kardzhali Dam.-Geography:...

, in the south of Bulgaria by him. The club has a page in Nov Jivot (New Life) - the official newspaper of Kardzhali - and up to late 2003, it had published over 60 issues. He also edited the magazine Kosmos.

He was also organizer and kind host of the annual Bulgarian science-fiction festival

Festival

A festival or gala is an event, usually and ordinarily staged by a local community, which centers on and celebrates some unique aspect of that community and the Festival....

"The 2002 Bulgacon", which took place in Kardzhali. The festival was attended by over 900 participants.

Kesarovski committed suicide in 2007 by jumping from a seventh-storey window of a hospital in Kardzhali.