What is winnowing? Where is it used?

Explanation

### Step-by-Step Solution:

1. **Definition of Winnowing**:
- Winnowing is a method used to separate components of a mixture based on their weight. It specifically separates heavier components from lighter ones.

2. **How Winnowing Works**:
- The process involves using wind or blowing air to facilitate the separation. When a mixture is tossed into the air, the lighter components are blown away while the heavier components fall down.

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