Analog robot
An analog robot is a type of robot which uses analog circuitry to go toward a simple goal such as finding more light or responding to sound. The first real analog robot was invented in the 1940s by William Grey Walter. The name of these robots were ELSIE and ELMER (Electro Mechanical Robot). The original circuitry was developed using two vacuum tubes and a photocell to search and follow a light. Recently a kind of analog robots was developed by Mark Tilden.
Karel Čapek
Karel Čapek introduced and made popular the frequently used international word "robot", which first appeared in his play "R.U.R." in 1920. While it is frequently thought that he was the originator of the word, he wrote a short letter in reference to an article in the "Oxford English Dictionary" etymology in which he named his brother, painter and writer Josef Čapek, as its actual inventor. In an article in the Czech journal "Lidové noviny" in 1933, he also explained that he had originally wanted to call the creatures "laboři" (from Latin "labor", work). However, he did not like the word, seeing it as too artificial, and sought advice from his brother Josef, who suggested "roboti" ("robots" in English).