Yes, in the sentence "Imagine that we are in a world where humans never developed the ability to speak - How would society look?", the use of the dash is correct.

Here are three more examples of correct use cases:

1. "I've always been fascinated by the concept of time travel - What if we could go back in history and change events?"
2. "I'm a fan of the movie - Can you tell me more about the production process?"
3. "The recipe for the chili - Can you share it with me?"
The dash is used to set off non-essential information, such as explanations, clarifications, or additional details. It is also used to emphasize certain words or phrases in a sentence.
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence