Are You Violating the Laws of Biology or Physics?

Look at information you have compiled or located. Look at it closely. If to make the story fit, you have to violate laws of biology (dead people do not typically reproduce, people who are not born do not have children, etc.) or  the laws of physics  (travelling 400 miles on land within two days in 1820, etc.), then there is a problem.

Violating common sense is not usually advised either.