Here's why:
* Unique and Undeciphered: The Indus script is unlike any known language or script. It has around 400 distinct signs, and while there are theories, no one has definitively cracked its meaning.
* Limited Evidence: The Indus script is found on seals, pottery, and other artifacts. The limited amount of text available makes deciphering it extremely challenging.
* No Rosetta Stone: Unlike the Egyptian hieroglyphs, which were deciphered thanks to the Rosetta Stone, there's no bilingual inscription that provides a key to understanding the Indus script.
While there have been attempts to link the Indus script to Brahmi, Tamil, or Kharosthi, none have been definitively proven.
The Indus Valley Civilization remains one of the most intriguing mysteries of ancient history.