Humans have eyebrows for ===
1. Protecting our vision from physical irritants
2. As a tool for social communication
The arched shape and outward direction of eyebrow hair keeps sweat and rain away from eyes.
They help catch dust and dirt before it can fall into eyes.
They help to reduce the glare from bright light.
Eyebrows are critical to identify people.
Eyebrows allow us to signal complex emotions such as skepticism, sympathy and surprise.
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