Q: Will I still have to pay taxes in 3001?
A: Only if you're a time-traveling accountant. Otherwise, the temporal displacement paradox will likely exempt you from tax liability.
Read more about temporal accounting
Q: Can I bring back any historical figure to help with my homework?
A: Unfortunately, historical figures are not available for homework help. They're either busy being assassinated or have better things to do, like being a Founding Father.
Learn about the proper etiquette for interacting with historical figures