--- title: "Meaning & Key Takeaway of: What then drove forward the evolution of…" description: "\"“What then drove forward the evolution of the massive human brain during those 2 million years? Frankly, we don’t know. Another singular human trait is..." image: "https://sms4smile.com/quotes/i/619/yuval-noah-harari-100_evolution_what-then-drove-forward-the-evolution-of_3079947.jpg" --- # What then drove forward the evolution of the massive human… ![“What then drove forward the evolution of the massive human brain during those 2 million years? Frankly, we don’t know. Another singular human trait is that we walk upright on two” quote by Yuval Noah Harari](https://sms4smile.com/quotes/i/619/yuval-noah-harari-100_evolution_what-then-drove-forward-the-evolution-of_3079947.jpg) [Download](https://sms4smile.com/quotes/i/619/yuval-noah-harari-100_evolution_what-then-drove-forward-the-evolution-of_3079947.jpg) [Open image](https://sms4smile.com/quotes/i/619/yuval-noah-harari-100_evolution_what-then-drove-forward-the-evolution-of_3079947.jpg) > ““What then drove forward the evolution of the massive human brain during those 2 million years? Frankly, we don’t know. Another singular human trait is that we walk upright on two”” [Yuval Noah Harari](https://sms4smile.com/quotes/author/yuval-noah-harari/) ## About This Quote This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation. The drivers of brain evolution remain uncertain, but upright walking is a unique human trait that shaped development. **In simple terms:** Upright walking is a key human trait; brain evolution unclear. Key Takeaway Study human evolution further. Themes evolution anthropology biology Mood curious inquisitive Type scientific philosophical When to use this quote - archaeology - education - public policy - science communication Key Concepts cognitive science phylogeny Questions to Reflect On - What other traits contributed to brain growth? - How does posture influence cognition? A Different Perspective Complex causes may be oversimplified. ★ ★ ★ ★ ★ No ratings yet [Evolution](https://sms4smile.com/quotes/about/evolution/) [Human brain](https://sms4smile.com/quotes/about/human-brain/) [Human Trait](https://sms4smile.com/quotes/about/human-trait-423127/) [Million years](https://sms4smile.com/quotes/about/million-years/) [Trait Walk](https://sms4smile.com/quotes/about/trait-walk-5248794/) [Walk Upright](https://sms4smile.com/quotes/about/walk-upright-1542741/) ## Related quotes > [A snake will always be a snake, even if you put a chain around its neck and try to make it walk upright.](https://sms4smile.com/quotes/lisa-alther/a-snake-will-always-be-a-snake-even-if-you-put-a-chain-around-its/) [Lisa Alther](https://sms4smile.com/quotes/author/lisa-alther/) > [“Human beings wear clothing and walk upright, but when you take that away, we're nothing but monkeys.”](https://sms4smile.com/quotes/osamu-tezuka/human-beings-wear-clothing-and-walk-upright-but-when-you-take-that/) [Osamu Tezuka](https://sms4smile.com/quotes/author/osamu-tezuka/) > [Why are we proud? 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