I, Robot is a fixup collection made up of science fiction short stories by American writer Isaac Asimov. The stories originally appeared in the American magazines Super Science Stories and Astounding Science Fiction between 1940 and 1950 and were then collected into a 1950 publication Gnome Press in 1950, in an initial edition of 5,000 copies.
Isaac Asimov was an American writer and professor of biochemistry at Boston University. During his lifetime, Asimov was considered one of the "Big Three" science fiction writers, along with Robert A. Heinlein and Arthur C. Clarke. A prolific writer, he wrote or edited more than 500 books. He also wrote an estimated 90,000 letters and postcards. Best known for his hard science fiction, Asimov also wrote mysteries and fantasy, as well as popular science and other non-fiction.
The Avogadro constant, commonly denoted NA or L, is an SI defining constant with an exact value of 6.02214076×1023 mol-1 (reciprocal moles). It is defined as the number of constituent particles (usually molecules, atoms, or ions) per mole (SI unit) and used as a normalization factor in the amount of substance in a sample. In practice, its value is often approximated as 6.02×1023 mol-1 or 6.022×1023 mol-1. The constant is named after the physicist and chemist Amedeo Avogadro (1776–1856).
The Galactic Empire series is a science fiction sequence of three of Isaac Asimov's earliest novels, and extended by one short story. They are connected by their early place in his published works and chronological placement within his overarching Foundation universe, set around the rise of Asimov's Galactic Empire, between the Robot and Foundation series to which they were linked in Asimov's later novels.
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Thiotimoline is a fictitious chemical compound conceived by American biochemist and science fiction author Isaac Asimov. It was first described in a spoof scientific paper titled "The Endochronic Properties of Resublimated Thiotimoline" in 1948. The major peculiarity of the chemical is its "endochronicity": it starts dissolving before it makes contact with water.
Pebble in the Sky is a science fiction novel by American writer Isaac Asimov, published in 1950. This work is his first novel — parts of the Foundation series had appeared from 1942 onwards in magazines, but Foundation was not published in book form until 1951. The original Foundation books are also a string of linked episodes, whereas this is a complete story involving a single group of characters.
The Gods Themselves is a 1972 science fiction novel written by Isaac Asimov, and his first original work in the science fiction genre in fifteen years. It won the Nebula Award for Best Novel in 1972, and the Hugo Award for Best Novel in 1973.
The Naked Sun is a science fiction novel by American writer Isaac Asimov, the second in his Robot series. Like its predecessor, The Caves of Steel, this is a whodunit story. It was first published in book form in 1957 after being serialized in Astounding Science Fiction between October and December 1956.
"Blind Alley" is a science fiction short story by American writer Isaac Asimov. It was first published in the March 1945 issue of Astounding Science Fiction, and later included in the collection The Early Asimov (1972).
The Galactic Empire is an interstellar empire featured in Isaac Asimov's Robot, Galactic Empire, and Foundation series. The Empire is spread across the Milky Way galaxy and consists of almost 25 million planets settled exclusively by humans. For over 12 millennia the seat of imperial authority was located on the ecumenopolis of Trantor, whose population exceeded 40 billion, until it was sacked in the year 12,328. The official symbol of the empire is the Spaceship-and-Sun. Cleon II was the last Emperor to hold significant authority. The fall of the empire, modelled on the fall of the Roman Empire, is the subject of many of Asimov's novels.
"Nightfall" is a 1941 science fiction short story by the American writer Isaac Asimov about the coming of darkness to the people of a planet ordinarily illuminated by sunlight at all times. It was adapted into a novel with Robert Silverberg in 1990. The short story has been included in 48 anthologies and has appeared in six collections of Asimov's stories. In 1968, the Science Fiction Writers of America voted "Nightfall" the best science fiction short story written prior to the 1965 establishment of the Nebula Awards and included it in The Science Fiction Hall of Fame Volume One, 1929–1964.
Milton La Salle Humason was an American astronomer. He worked with Edwin Hubble to measure the redshift of nebulas in the early 20th century, providing evidence of the expansion of the universe.
Fantastic Voyage II: Destination Brain is a science fiction novel by American writer Isaac Asimov, published in 1987. It is about a group of scientists who shrink to microscopic size in order to enter a human brain so that they can retrieve memories from a comatose colleague.
"History" is a science fiction short story by American writer Isaac Asimov. It was first published in the March 1941 issue of Super Science Stories and reprinted in the 1972 collection The Early Asimov.
"No Connection" is a science fiction short story by American writer Isaac Asimov. It was first published in the June 1948 issue of Astounding Science Fiction and reprinted in the 1972 collection The Early Asimov.
"Half-Breed" is a science fiction short story by American writer Isaac Asimov. It was first published in the February 1940 issue of Astonishing Stories and reprinted in the 1972 collection The Early Asimov. It was the fifteenth story written by Asimov, and the fourth to be published. At 9000 words, it was his longest published story to date.
"Time Pussy" is an early science fiction short story by American writer Isaac Asimov.