And then there's a 1903 note by Twain that might ordinarily be overlooked, so insignificant does it seem: an answer to a correspondent who challenged Twain's argument that lying can sometimes be a virtue.
Today, interorganizational collaborations are considered to be an answer to a range of challenges that may hamper businesses from remaining competitive.
There are always those who think the answer to a challenge is to retreat to an imagined glorious past.
However, emerging technologies in the complete energy sector could give a suitable answer to a challenge not very well defined so far.
"We believe our budget is a good answer to a challenging question - how we continue to invest in our region when the public finances are under more pressure than ever," he said.
Did Epicurus have an answer to such a challenge?
But his message, an answer to the challenge of campaigning against an incumbent administration during peace and prosperity, was mostly unchanged.
Wilder's next novel, "Heaven's My Destination," was in part an answer to that challenge.
The paper advocates a global workspace architecture, with its ability to manage massively parallel resources in the context of a serial thread of computation, as an answer to this challenge.
Sustainable development seemed to be an answer to this challenge under the premise of limited resources.
Korea's past offers an answer to this challenge.
