Complex events are blamed on one cause as opposed to many
possible causes. For example, the Iraq War is blamed on terrorism as opposed
to many possible and interacting causes.
Many books have been written about human origins but we still don't know
everything about the subject. More discoveries may be made, new conclusions
can always be found.
A husband and wife can be married for 50 years or longer and, though they
believe they know everything about each other, something that is said or
done will come as a surprise.