"""Create fact_checker
Generated by Phi-Octopus Eden
2025-11-07 01:01:28.074460
"""

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


class FactChecker:
    """
    A simple fact-checking class that evaluates statements against a predefined 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 statement is true based on the knowledge base.

        :param statement: The fact to check.
        :return: True if the statement is in the knowledge base and marked as true, False otherwise.
        """
        return self.knowledge_base.get(statement.lower(), False)

    def update_knowledge(self, updates: Dict[str, bool]):
        """
        Updates or adds new facts to the knowledge base.

        :param updates: A dictionary of statements with their truth values.
        """
        for statement, value in updates.items():
            self.knowledge_base[statement.lower()] = value

def example_usage():
    # Creating a fact checker with some initial facts
    fact_checker = FactChecker({
        "the earth is round": True,
        "python is difficult to learn": False,
        "artificial intelligence will dominate the world": None  # Placeholder for uncertain statements
    })

    print(f"Is the Earth round? {fact_checker.check_fact('The earth is round')}")  # Expected: True

    # Adding new facts
    fact_checker.update_knowledge({
        "the moon orbits around the earth": True,
        "water boils at 100 degrees Celsius": True
    })

    print(f"Is water's boiling point correct? {fact_checker.check_fact('Water boils at 100 degrees Celsius')}")  # Expected: True

if __name__ == "__main__":
    example_usage()
```

This code defines a `FactChecker` class capable of checking the truth value of statements against a predefined knowledge base. It includes methods to check individual facts and update the knowledge base with new information. The example usage demonstrates how to create an instance, add initial facts, and verify the correctness of statements.