"""Create fact_checker
Generated by Phi-Octopus Eden
2025-11-08 17:09:26.170014
"""

```python
from typing import List, Dict, Any

class FactChecker:
    """
    A simple fact-checking system that verifies the truthfulness of statements based on predefined knowledge.
    
    Attributes:
        knowledge_base (Dict[str, bool]): A dictionary mapping statements to their boolean truth values.
        
    Methods:
        __init__(self, knowledge_base: Dict[str, bool])
            Initializes the FactChecker with a given knowledge base.
            
        check_fact(self, statement: str) -> bool
            Checks if a fact is true based on the predefined knowledge.
            
        add_knowledge(self, statement: str, truth_value: bool)
            Adds or updates a piece of knowledge in the knowledge base.
    """
    
    def __init__(self, knowledge_base: Dict[str, bool]):
        self.knowledge_base = knowledge_base
    
    def check_fact(self, statement: str) -> bool:
        """Checks if the given fact is true based on the current knowledge."""
        return self.knowledge_base.get(statement, False)
    
    def add_knowledge(self, statement: str, truth_value: bool):
        """Adds or updates a piece of knowledge in the knowledge base."""
        self.knowledge_base[statement] = truth_value


# Example usage
if __name__ == "__main__":
    # Initialize FactChecker with some predefined facts
    fact_checker = FactChecker({
        "The Earth is round": True,
        "2 + 2 equals 5": False,
        "AI will dominate the world": None  # Placeholder for undetermined statements
    })
    
    # Check a fact
    print(f"Is 'The Earth is round' true? {fact_checker.check_fact('The Earth is round')}")
    
    # Add new knowledge
    fact_checker.add_knowledge("AI can learn from data", True)
    print(f"After adding new knowledge, is 'AI can learn from data' true? {fact_checker.check_fact('AI can learn from data')}")
```