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it helps you learn about history and the old events that happened
We learn about violent events in history's because it is important to us what happened in the past that we still remember.
don't let it happen (again) in our time.
Lessons come from events not people and your question is too vague to give you a proper answer. We need a time or place.
People today can learn valuable lessons from historical events and those individuals who came before us.
get lessons
From the episode Black Widower, we learn Patty and Selma are 41 years old.
nothing
get lessons
take lessons. if you want to learn the correct fingerings and positions then take lessons from a professional
History is studied to learn of the mistakes and successes of humankind. With such knowledge, successes can be made to fit modern times and mistakes and errors of the past can be avoided. History can also be studied simply on the basis of seeing what events happened in the past.
they take lessons