Pencil lead. While modern pencils don’t contain lead, that’s still what we call the graphite compound. When real lead was used in pencils it was mined and nearly everyone has used a pencil at some point in their life.
Mrs. Shine was having a rough day and wanted a break. So she asked her class to calculate the sum of the first 50 odd numbers. In a few moments, Winifred was at her desk with the correct answer of 2,500. Stunned, Mrs. Shine figured she must have gotten lucky, and sent precocious Winifred back to her seat with the task of finding the sum of the first 75 odd numbers. Again, Winifred returned in seconds with the correct answer (5,625).
During lunch hour a group of boys from Mr. Bryant’s homeroom visited a nearby grocery store. One of the five took an apple.
Jim said, “It was Hank or Tom”. Hank said, “Neither Eddie nor I did it.” Tom said, “Both of you are lying.” Don said, “No, one of them is lying, the other is speaking the truth.” Eddie said, “No, Don, that is not true.” When Mr. Bryant was consulted, he said, “Three of these boys are always truthful but two will lie every time.”
Tom took the apple Jim was telling the truth Hank was telling the truth Tom was lying Don was lying Eddie was telling the truth (three telling the truth and two lying)