Depends on what you call 'useful'. If it is useful to learn how to kill hundreds of people in the shortest amount of time, and to learn how to castrate hundreds of men in the shortest time, then, yeah, they were useful.
tworeasons we should learn about the holocaust
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The crowd wanted to rejoice in Caesar's triumph.
To learn What God wants you to be like and to learn about Jesus and His Chosen People
It is useful for people to learn about some of he basic operations of arithmetic.
To amerce themselves into other cultures. To learn about there ancestry
It is easy to learn about how to tag people on Facebook. There is a helpful Facebook blog and also help pages useful on the relevant issue of tagging.
They provide interesting fields of academic investigation and study. Some provide useful guidance on handling problems of the present time, if people were only willing to learn from past experience. Many stories make interesting and even entertaining reading.
Bias can be useful to historians by allowing them to learn about people's opinions and beliefs.
There are no reasons not to read. Reading is a valuable and necessary tool to learn, and a source of enjoyment for many, many people. Reading would help you learn what a truly dumb question this is.
it is good for many reasons it helps our brain and our writing