Exam LSAT Topic 2 Question 65 Discussion

The raisin business in America was born by accident. It happened in 1873 in the SanJoaquin Valley of California. Many farmers raised grapes in this valley. That year, justbefore the grape harvest, there was a heat wave. It was one of the worst heat waves everknown. It was so hot the grapes dried on the vines. When they were picked, California hadits first raisin crop.People were surprised to find how good raisins were. Everybody wanted more. So the SanJoaquin farmers went into the raisin business. Today, of course, they do not let the grapesdry on the vines. They treat them with much more care.In late August the grapes start to ripen. They are tested often for sweetness. The growerswait until the sugar content is twenty-one percent. Then they know the grapes are ripeenough to be picked.Skilled workers come to the vineyards. They pick the bunches of grapes by hand. Theworkers fill their flat pans with grapes. They gently empty the pans onto squares of paper.These squares lie between the long rows of vines. They sit in the sun.Here the grapes stay while the sun does its work. It may take two weeks or longer. Thegrapes are first dried on one side. When they have reached the right color, they are turnedto dry on the other side. The grapes are dried until only fifteen percent of the moisture isleft. Then they have turned into raisins.The raisins are rolled up in the paper on which they have dried. Trucks take them from thefields. They are poured into big boxes called sweatboxes. Each box holds one hundred andsixty pounds of raisins. Here, any raisins that are a bit too dry take moisture from thosethat have a bit too much. After a while they are all just moist enough.The big boxes are trucked next to the packaging plant. They are emptied onto a conveyorbelt that shakes the raisins gently. This knocks them from their stems. A blast of air whisksthe stems away. The water bath is next. Then the plump brown raisins have a lastinspection. They are again checked for moisture and sugar. Then they go on a belt topacking machines. Here they are poured into packages, which are automatically weighedand sealed. The raisins are now ready for market.What is the main idea of this passage?