Here's why:
* No definitive record exists: While we know Keller's journey of learning to communicate was remarkable, there's no official record detailing her exact vocabulary growth over specific time periods.
* Learning is complex: Learning language involves more than just memorizing words. It's about understanding their meaning, usage, and how they fit together in sentences.
* Varying definitions: What constitutes a "word" can be subjective. Does it include signs, fingerspelling, or spoken words?
Instead of focusing on a specific number, it's more important to understand:
* The incredible impact of her teacher, Anne Sullivan: Sullivan's dedication and innovative teaching methods were crucial to Helen Keller's progress.
* The power of perseverance: Keller's story is a testament to the human spirit's ability to overcome obstacles.
Remember, Helen Keller's journey was about far more than simply learning words. It was about learning to experience and understand the world around her in a way that seemed impossible.