Li Bai’s twenty-syllable poem is the most memorized poem in human history

Evidence

Li Bai’s ‘Quiet Night Thoughts’ is perhaps the single most memorized poem in human history — known by heart by well over a billion people. In just twenty syllables it captures homesickness so perfectly that it has lasted 1,300 years. — , A Year of World Stories, 7870

Categorization

• QUESTION: The claim that this poem is memorized by over a billion people is striking and worth verifying/enriching — which poem actually ranks first, and how is memorization even measured across languages?