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 quizThe 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.”
“Because it is there.”
“I don’t know. I thought it would be cool.”
“Mostly because it seemed like a neat idea.”
“I did not know and I do not know why.”
“Nothing, I guess.”
“I’m doing a (free) operating system (just a hobby, won’t be big and professional like GNU).”
“I was looking for a ‘hobby’ programming project that would keep me occupied during the week around Christmas.”
“The best kind of research is curiosity driven research.”
“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.”
“I have never done anything ‘useful’.”
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.”
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.”
“The scientist does not study nature because it is useful; he studies it because he delights in it.”
“An expert is a person who has made all the mistakes that can be made in a very narrow field.”
“The formulation of a problem is often more essential than its solution.”
“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.”
“The imagination of nature is far, far greater than the imagination of man.”
“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.”
“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.”
“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.”
“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.”
“I think a life properly lived is just learn, learn, learn all the time.”
“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.”
“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.”
Bertrand Russell on efficiency and working hours
“Suppose the world's pin supply was met by everyone in the pin industry working 8 hours a day, then someone invents a tool that doubles everyone's efficiency. What do we think would happen? In a sensible world, everybody concerned [would work] 4 hours instead of 8, and everything would go on as before. But in the actual world [they] still work 8 hours, there are too many pins, some employers go bankrupt, and half the people previously concerned in making pins are thrown out of work...”
Karl Marx on saving and alienated life
“The less you eat, drink, buy books, go to the theatre or to balls, or to the pub, and the less you think, love, theorize, sing, paint, fence, etc., the more you will be able to save and the greater will become your treasure which neither moth nor rust will corrupt—your capital. The less you are, the less you express your life, the more you have, the greater is your alienated life and the greater is the saving of your alienated being.”
Arthur Schopenhauer on reading and thinking for oneself
“When we read, another person thinks for us: we merely repeat his mental process. It is the same as the pupil, in learning to write, following with his pen the lines that have been pencilled by the teacher. Accordingly, in reading, the work of thinking is, for the greater part, done for us. This is why we are consciously relieved when we turn to reading after being occupied with our own thoughts. But, in reading, our head is, however, really only the arena of some one else’s thoughts. And so it happens that if any one spends almost the whole day in reading, and by way of relaxation devotes the intervals to some thoughtless pastime, he gradually loses the capacity for thinking; just as a man who is always riding at last forgets how to walk. This is the case with very many learned persons: they have read themselves stupid. For to occupy every spare moment in reading, and to do nothing but read, is even more paralyzing to the mind than constant manual labor, which at least allows those engaged in it to follow their own thoughts. A spring never free from the pressure of some foreign body at last loses its elasticity; and so does the mind if other people’s thoughts are constantly forced upon it. Just as you can ruin the stomach and impair the whole body by taking too much nourishment, so you can overfill and choke the mind by feeding it too much. For the more you read, the fewer are the traces left by what you have read: the mind becomes like a tablet crossed over and over with writing. There is no time for rumination; and in no other way can you assimilate what you have read. If you read on and on without setting down your own thoughts, what has been read does not take root, but is for the most part lost. It is, in fact, just the same with mental as with bodily food: hardly the fifth part of what one takes is assimilated. The rest passes off in evaporation, respiration and the like.
Reading is thinking with some one else’s head instead of one’s own. To think with one’s own head is always to aim at developing a coherent whole—a system, even though it be not a strictly complete one; and nothing hinders this so much as too strong a current of others’ thoughts, such as comes of continual reading.”
Donald Knuth on creativity and finding good questions
“And I think we should also try to guess what theorems are coming up; or, at least, to figure out how and why anybody would try to prove such theorems in the first place. We should imagine ourselves in the discoverer’s place. The creative part is really more interesting than the deductive part. Instead of concentrating just on finding good answers to questions, it’s more important to learn how to find good questions!
You’ve got something there. I wish our teachers would give us problems like, ‘Find something interesting about x,’ instead of ‘Prove x.’
Exactly. But teachers are so conservative, they’d be afraid of scaring off the ‘grind’ type of students who obediently and mechanically do all the homework. Besides, they wouldn’t like the extra work of grading the answers to nondirected questions.
The traditional way is to put off all creative aspects until the last part of graduate school. For seventeen or more years, a student is taught examsmanship, then suddenly after passing enough exams in graduate school he’s told to do something original!
Right. I doubt if many of the really original students have stuck around that long.
Oh, I don’t know, maybe they’re original enough to find a way to enjoy the system. Like putting themselves into the subject, as we were saying. That would make the traditional college courses tolerable, maybe even fun.
You always were an optimist. I’m afraid you’re painting too rosy a picture. But look, the rain has stopped, let’s lug this rock back to camp and see what it says.”
