Egyptologists had a way to know if their work sounded right, something we just don't have with the Indus script. Scholars do have a pretty good guess about what kind of language they spoke. Dravidian is a family of languages that are mostly found in South India. There's reason to believe these languages may have started in the Indus Valley and then migrated south later on.
The Indus Valley civilization was one of the largest, most advanced civilizations in the ancient world. But we barely know anything about them, in large part because we haven’t been able to decipher the cryptic symbols they left behind.
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