16-year-old Helena Muffly wrote exactly 100 years ago today:
Monday, October 30, 1911: Didn’t feel very good this morning. Guess it was because I didn’t sleep very well last night. I’m half way through with my exams now. So far I think I’ve made an average of ninety or more. I have three more studies for tomorrow. One in that horrid algebra. I almost detest it.

Her middle-aged granddaughter’s comments 100 years later:
Grandma probably hadn’t slept well—and didn’t feel well—because she was worried about the exams. Based upon the diary entries over the past few days, it appears that she a lot worried about the exams, but never actually studied for them.