"""Create fact_checker
Generated by Phi-Octopus Eden
2025-11-06 03:46:02.340530
"""

```python
from typing import List, Dict

class FactChecker:
    def __init__(self):
        self.knowledge_base: Dict[str, bool] = {}

    def add_knowledge(self, claim: str, verified: bool) -> None:
        """
        Adds a fact to the knowledge base.

        :param claim: The statement or claim to verify.
        :param verified: Whether the claim is true (True) or false (False).
        """
        self.knowledge_base[claim] = verified

    def check_fact(self, claim: str) -> bool:
        """
        Checks if a fact in the knowledge base is true.

        :param claim: The statement to check.
        :return: True if the fact is verified as true, False otherwise.
        """
        return self.knowledge_base.get(claim, False)

    def update_fact(self, claim: str) -> None:
        """
        Updates a previously added fact's verification status.

        :param claim: The statement to re-verify.
        """
        if claim in self.knowledge_base:
            # Simulate user input for updating fact
            new_status = input(f"Is the claim '{claim}' true? (y/n): ")
            if new_status.lower() == 'y':
                self.knowledge_base[claim] = True
            elif new_status.lower() == 'n':
                self.knowledge_base[claim] = False

    def list_facts(self) -> List[str]:
        """
        Lists all the facts currently in the knowledge base.

        :return: A list of claims with their verification status.
        """
        return [(k, v) for k, v in self.knowledge_base.items()]

# Example usage
if __name__ == "__main__":
    fact_checker = FactChecker()
    fact_checker.add_knowledge("The Earth is round", True)
    print(fact_checker.check_fact("The Earth is round"))  # Expected: True

    fact_checker.update_fact("The Earth is round")
    print(fact_checker.check_fact("The Earth is round"))  # User input required to simulate update
```