The author of “String Theory” believes that the quipu was used as a calculator by the Incas. Which important detail supports that summary? A.
Most of us do not do math without a calculator.

B.
The knots in the dangling strings represented numbers.

C.
Quipus are made of cotton and wool strings.

D.
The quipu knots represent letters.

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In "tell me, o swan, your ancient tale," to what does the land where no doubt nor sorrow have rule refer? nature heaven the promised land an imaginary country

Read the excerpt from "home front diary." jimmy simmons stopped by today to tell me that he had enlisted in the army. he asked me if i would write to him, and i said i would. i told him that i've been writing to my uncle arthur and susan's cousin john for about a year, and as an experienced correspondent i had some advice about all the censorship. "don't write down any information about your location or the number of soldiers in your unit because the censors will cut all of that away," i said. "in my experience, loose lips not only sink ships, they make letters look like snowflake decorations! ” well, he belly laughed over that one. how is the author's perspective different from jimmy's? the author has been to war and she can give jimmy advice. jimmy has become a soldier and does not believe the author’s advice. the author has experience writing to soldiers but jimmy does not. jimmy has more experience at letter writing than the author.