How do scientist such as anthropologists or archeologists determine how long ago an artifact was created, or how long ago a fossilized creature lived?
In today’s society, the products we consume often come with an expiration date; a date that tells us when we should use the product by: "Best if used by…" Ancient artifacts and fossils do not come with dates stamped on them. Thus, scientists must use detective work to determine their date of origin.
Happiness depends upon ourselves.
Dinner guests in medieval England were expected to bring their own knives to the table.