Self-tutoring about everyday materials and how to work with them: the tutor mentions a situation he faced yesterday. I recently went through my belts to assess which ones weren’t fit for purpose anymore. Some, the finish was cracking around well-used …
Self-tutoring about family relations: the tutor mentions an example of classifying one. The following is according to my understanding. Yesterday I was talking about cousins (post here) and “once removed” (post here). The other person asked about a specific example: …
Self-tutoring about family trees: the tutor mentions the idea of “once removed.” The following is according to my understanding. As I mention in my post from yesterday about cousins and second cousins, some of my awareness about family trees developed …
Self-tutoring about terminology in family trees: the tutor begins with cousins. The following is according to my understanding. When I was a kid, one often heard about cousins, especially in the Annapolis Valley. It made sense: it was a farming …
Family trees: what is a cousin and a second cousin? Read more »
Self-tutoring about chemistry: the tutor mentions the terms flash point, fire point, and ignition point. The following is according to my understanding. I mention, in my post from June 22, 2018, the comparison between flash point and fire point. Fire …
Chemistry: flash point, fire point, and ignition point Read more »
Self-tutoring about everyday health: the tutor mentions the endurance of influenza A and B on surfaces. The following is according to my understanding. Apparently, cold and flu viruses last longer on flat, hard surfaces than on soft surfaces like paper …
Biology, health: how long do some flu viruses last on surfaces? Read more »
Tutoring math, the fraction button can offer workarounds. The tutor mentions how to reduce fractions on the Casio fx-260Solar Fraction and Casio fx-260Solar II models. The following is according to my understanding. Reducing a fraction means putting it in lowest …
Tutoring statistics, calculators are important. The tutor mentions how to use inverse normal on the Casio fx-991ES PLUS C. The following is according to my understanding. I mention the concept of the inverse normal in my post from January 25, …
Statistics: inverse normal on the Casio fx-991ES PLUS C Read more »
Tutoring math, one discovers idiosyncrasies of equations. The tutor mentions one about quadratics. The following is according to my understanding. Thumbing through an old textbook, I encountered the idea that, with a quadratic, its two roots (answers) add up to …
Math: quadratic equations: the sum of the roots formula Read more »
Self-tutoring about email and computer security: the tutor mentions some recent arrivals. The following is according to my understanding. I mention, back in my post from January 19, 2026, a situation in which an email server detected a phishing attempt …