From its violet fluorescence
fluorene (plural fluorenes)
(organic compound) A polycyclic aromatic hydrocarbon consisting of two benzene rings joined together directly, and also via a methylene bridge; it is used in light-emitting diodes.
Source: Wiktionary
Flu`or*ene, n. (Chem.)
Definition: A colorless, crystalline hydrocarbon, C13H10 having a beautiful violet fluorescence; whence its name. It occurs in the higher boiling products of coal tar, and is obtained artificially.
Source: Webster’s Unabridged Dictionary 1913 Edition
19 December 2024
(noun) a permanent executive committee in socialist countries that has all the powers of some larger legislative body and that acts for it when it is not in session
Coffee dates back to the 9th century. Goat herders in Ethiopia noticed their goats seem to be “dancing” after eating berries from a particular shrub. They reported it to the local monastery, and a monk made a drink out of it. The monk found out he felt energized and kept him awake at night. That’s how the first coffee drink was born.
