Miscellaneous

Here are a few miscellaneous things that I have made, find interesting, etc. The order the blocks appear in is randomized, so when you refresh the page, something different may appear first! If you would like to randomize it yourself without having to refresh the page, just press this button:

What Type of Economist Should I Be?

Many of my non-economist friends have heard me talk about "applied-micro economists" or "development economists" and asked me: "What type of economist would I be?" This (very silly) BuzzFeed-style quiz is the culmination of these conversations.

Take the quiz

The Mathematics Genealogy Project tracks advisor-student relationships in mathematics and related fields, making it possible to trace academic lineages across generations. Herakles M. Polemarchakis is my supervisor, and through him I have many famous academic ancestors.

The rotating panel below highlights some of the people connected to my mathematical genealogy.

My mother, Sue Challis (née Shotton)

My mother, Sue Challis (née Shotton), was a professional trampolinist. According to AinsworthSports, she had two careers, each worthy of being in the top 50 greatest female trampoline athletes of all time. Under her maiden name, Sue Shotton, she is ranked as the 14th greatest, and under her married name, Sue Challis, she is ranked as the 46th greatest. She was also part of the inaugural class of the Loughborough Sport Hall of Fame and is listed in the World Acrobatics Society Trampoline / Tumbling Legends Hall of Fame.

Career highlights include:

  • 11-time British Ladies Champion.
  • Double European Ladies Champion (1983, 1993).
  • Triple gold medalist at the 1984 Trampoline Gymnastics World Championships (individual, synchro, and team).

An assortment of quotes

A collection about curiosity, play, and interesting questions—and how usefulness sometimes arrives later.

“I guess I’ll invent a game.”

— Alfred Butts, inventor of Scrabble

“Because it is there.”

— famously attributed to George Mallory when asked why he wanted to climb Mount Everest

“I don’t know. I thought it would be cool.”

— Will Wright, creator of SimCity, on his motivation

“Mostly because it seemed like a neat idea.”

— Ray Tomlinson, on why he invented email

“I did not know and I do not know why.”

— J.R.R. Tolkien, recalling the origin of The Hobbit

“Nothing, I guess.”

— Heinrich Hertz, reportedly, when asked what would come from his work on electromagnetic waves

“I’m doing a (free) operating system (just a hobby, won’t be big and professional like GNU).”

— Linus Torvalds, announcing the project that became Linux in 1991

“I was looking for a ‘hobby’ programming project that would keep me occupied during the week around Christmas.”

— Guido van Rossum, on beginning what became Python

“The best kind of research is curiosity driven research.”

— Barry Marshall, Nobel laureate in medicine

“Elaborate apparatus plays an important part in the science of today, but I sometimes wonder if we are not inclined to forget that the most important instrument in research must always be the mind of man.”

— W. I. B. Beveridge

“I have never done anything ‘useful’.”

— G. H. Hardy, A Mathematician’s Apology

Since then Hardy's work has gone on to be fundamental to cryptography and secure digital communication.

“Thank God that number theory is unsullied by any application.”

— attributed to Leonard Eugene Dickson

Number theory is now central to public-key cryptography, encryption, digital signatures, and secure communication.

“The sole end of science is the honor of the human mind.”

— Carl Gustav Jacob Jacobi, writing to Legendre in 1830

“The scientist does not study nature because it is useful; he studies it because he delights in it.”

— Henri Poincaré

“An expert is a person who has made all the mistakes that can be made in a very narrow field.”

— Niels Bohr (commonly attributed)

“The formulation of a problem is often more essential than its solution.”

— Albert Einstein and Leopold Infeld, The Evolution of Physics

“To deal with hyper-planes in a 14-dimensional space, visualize a 3-D space and say ‘fourteen’ to yourself very loudly. Everyone does it.”

— Geoffrey Hinton

“The imagination of nature is far, far greater than the imagination of man.”

— Richard Feynman

“We act as though comfort and luxury were the chief requirements of life, when all that we need to make us happy is something to be enthusiastic about.”

— Charles Kingsley

“Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great.”

— Mark Twain

“A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it.”

— Max Planck

“A complex system that works is invariably found to have evolved from a simple system that worked. The inverse proposition also appears to be true: A complex system designed from scratch never works and cannot be made to work.”

— John Gall

“I think a life properly lived is just learn, learn, learn all the time.”

— Charlie Munger

“Lies are often much more plausible, more appealing to reason, than reality, since the liar has the great advantage of knowing beforehand what the audience wishes or expects to hear.”

— Hannah Arendt

“Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social environment. Most people are even incapable of forming such opinions.”

— Einstein