telltale
n.— «They’ve got a “tell-tale” tracking needle on the tachometer. Shows you the highest RPM a driver just reached on the track.» —“Studdard’s Ambition Burns On: At Age 51, SCCA Driver Wants to Try NASCAR” by Bill Robinson Atlanta Journal-Constitution (Ga.) Oct. 15, 1989. (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...
Asthenosphere, a geologist’s term for the molten layer beneath the earth’s crust, sparks a journey that stretches all the way from ancient Greece to the author of Uncle Tom’s Cabin. Plus: What the heck is a dogberg? It’s when...