This is a Twitter essay on the history of leprosy, to commemorate World Leprosy Day, 29 January 2023. I’ve chosen for my theme this year the “bookend” discoveries of the two known species of bacteria that cause leprosy: that is, the discovery of Mycobacterium leprae by Armauer Hansen 150 years ago, and the discovery of Mycobacterium lepromatosis…[Read more]

discussion, philosophical and technical, of the future of the Internet and Web,
based on two classics of the literature.

Abstract: The causes of suffering are a central topic in Buddhism as well as in Ayurveda. The Pāli Canon and other early Buddhist texts like the Milindapañha mention eight specific causes resulting in disease or suffering at several places. In contrast, early Ayurveda, as presented in the Carakasaṃhitā, knows a threefold causal complex of dise…[Read more]

This article provides insights into Grade 11 learner understanding of the roots of quadratic equations, how learners used solution strategies to find equations with given roots, how they determine the unknown values and the other root when one root is given and how they determine the unknown values when two roots of the equation are given. The…[Read more]