bubble
n.— «Someone who offers them money is said to “flip them a bill,” and police officers are affectionately known as “bubbles.”» —“Beggars can be choosers” by Dina Chaiffetz Denver Post (Colorado) Aug. 5, 2007. (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...