the.com/knowledge
the only thing that multiplies when you give it away instead of shrinking
means The understanding, facts, skills, and awareness a person has gained through learning or experience.
from From Middle English 'knowleche,' built from the verb 'knowen' (to know) plus a suffix '-leche' that signaled a state or condition — the same kind of ending that survives, transformed, in '-ledge.' The 'know' part traces back to Old English 'cnāwan,' a deep Germanic root with cousins across the Indo-European family — related to Latin 'gnoscere' and Greek 'gignōskein,' both meaning to know or recognize, which is why English also carries borrowings like 'cognition' and 'diagnosis.'
library originLibrary of Alexandria copied every ship's books on arrival
forgetting curveYou lose half of new facts within an hour
oldest schoolMorocco's University of al-Qarawiyyin runs since 859 AD
brain trickTeaching something cements it better than restudying it