by Hari Balasubramanian
Ecology is quite distant from my academic work in engineering, but I’ve developed a great love for it in recent years. To learn the basics, I’ve tried many books and articles, but I often turn to the college-level biology textbook Principles of Life. Like many academic texts, this one is not suited for cover-to-cover reading – at over 1000 pages, it is too heavy even to hold comfortably! Still, every time I’ve flipped through its pages, there’s been something interesting to reflect on.
My favorite figure (below) is from the book’s ecology section, and it leads us to the biodiversity theme of this essay. The biological diversity of a region can be quantified in many ways. One intuitive measure is the number of distinct species of a taxonomic group in the region — for instance, the number of species of birds, mammals, or primates found there.

The bar graph on the right shows how the number of butterfly species in the swallowtail family (x-axis) varies by latitude in the Americas (y-axis). In the formal taxonomic system, the family is called Papilionidae and it contains over 550 species. The graph tells us that the number of swallowtail species in the Americas – and hence swallowtail diversity – increases as we move from the higher latitudes in the north and south toward the equator, where it peaks. It’s fascinating that the species count distribution follows a bell curve centered around the equator, but it’s skewed towards the north, perhaps because North America contains more land area. Read more »


What do swimming, running, bicycling, dancing, pole jumping, tying shoelaces, and reading all have in common? According to John Guillory’s new book On Close Reading, they are all cultural techniques; in other words, skills or arts involving the use of the body that are widespread throughout a society and can be improved through practice. The inclusion of reading (and perhaps, tying shoelaces) may come as a surprise, but it is Guillory’s goal in this slim volume to convince us that reading, and in particular, the practice of “close reading,” is a technique just like the others he mentions. This is his explanation for the questions he explores throughout the book—namely, why the practice of “close reading” has resisted precise definition, and why the term itself was so seldom used by the New Critics, the group of theorists most associated with it.
A number of books published in Ireland in the past few years relate to the centenaries of the First World War and the fight for Irish independence. Apart from being an opportunity to sell books, the conjuncture afforded readers an opportunity to reflect while delving into a receding page of history. Mary O’Donnell’s narrative collection Empire includes interlinked short stories dealing with the revolutionary period, along with a novella-length title piece. Notwithstanding its historical tie-in and informative potential, the true raison d´être of this book is the pleasure of reading.
When I started as a Monday columnist at 3 Quarks Daily in July of last year, my debut 





Sughra Raza. Approaching Washington, November 2024.


Oops. During most of 2024, all the talk was of deep learning hitting a wall. There were secret rumors coming out of OpenAI and Anthropic that their 

My great-grandparents were among the 12 million immigrants who passed through Ellis Island and equally a part of the wave of 20 million immigrants who entered the United States between 1880 and 1920. America’s fast-growing economy needed more manpower than its existing population had available, and the poorer classes of Europe were the beneficiaries including four million Italians (largely southern) and two million Jews.