Visit our Data & Figures, Earth Institute and CSAS.org Websites. Sign up for my occasional Communications here. Recent Communications September 16, 2025: Nature's Corridor / Sophie's Planet, Chapter 1 ...

Rajiv Sethi is a Professor of Economics at Barnard College, Columbia University and an External Professor at the Santa Fe Institute. He was a 2020-21 Joy Foundation Fellow at the Harvard Radcliffe ...

My name is Cynthia Rush and I am an Associate Professor of Statistics in the Department of Statistics at Columbia University. In May, 2016, I received my Ph.D. in Statistics from Yale University under ...

“The best things of the moment were outside the rectangle of Columbia; the best things of all human history and thought were inside the rectangle,” wrote Pulitzer Prize-winner Herman Wouk, Columbia ...

I am a Ritt Assistant Professor at Columbia University. Previously, I completed my PhD in Mathematics at Northwestern University in Spring 2021 under the guidance of Ben Weinkove. My research ...

This site provides information about this course, offered in the Fall of 2025. (Last year's website for this course: GR6037_f24) Problem sets will be distributed on this website on or before Thursday ...

What is "Simon"? A very simple model, mechanical brain — the smallest complete mechanical brain in existence. The machine was conceived by Edmund C. Berkeley, president of E.C. Berkeley and Associates ...

The story of Columbia University is one of tradition, innovation, and impact. For more than 270 years, Columbia alumni, ...

Digital Equipment Corporation's 36-bit PDP-10 was, arguably, the birthplace of both the Internet and the Open Source movement, and without argument, the source of many of the most influential software ...

General Format: All reports are written in HTML code using Netscape Composer (available here) and undergo two iterations of review and revisions before completion. Eventually, those that meet the ...

The IBM 285 Tabulator Click each image to enlarge. IBM 285 with operator The IBM Type 285 Tabulator Photo: [4]. IBM 285 plugboard The IBM Type 285 Numeric Printing Tabulator, 1933, used in the Thomas ...

On the modern Google map at left, I traced the outline of Hall's Hill as best I can, given that I've never seen a proper map of it. Towards the upper center of the map, the circled A marks my ...