zeitgeber n. a naturally occurring cue, such as light or temperature, which regulates biological rhythms; something which influences or regulates the timing or rhythm of something else. Etymological Note: zeit ‘time’ + geber ‘giver.’ Coined by Jürgen Aschoff, ca. 1954. (source: Double-Tongued Dictionary)
Further reading
Astronauts returning from space say they experience what’s called the overview effect, a new understanding of the fragility of our planet and our need to reflect on what humans all share as a species. A book about the end of the universe...
Sean in Oneonta, New York, says that when he was growing up in New Jersey, his family would pile in the car and set off on a surprise adventure, whether a short distance or long, and the kids would be told only that they were going on Buxtehude...
what does the biological organizion mean. I need a definnion of the word?