## Why and how to start a for-profit company serving emerging markets

why it’s one of the most effective ways to improve the world • why it’s hard • “local context plus high standards” • how to get started • where to live • what to work on

## Autocomplete as an interface

the real reason zsh beats bash • how I got twice as fast in python • autocompleting all the things • maximizing user-interface bandwidth

## Why squared error?

its computational convenience • connections to the Gaussian distribution • differentiability and basis independence • why *not* squared error • absolute-error methods

## Advice on running an effective altruism student group

have two people • don’t be embarrassed • getting famous speakers • navigating bureaucracy • outside support • lessons from the philanthropy fellowship • advertising strategies

## Plants, continued fractions, and the golden ratio

where should one grow one’s leaves? • sunlight maximization • the most irrational number • Fibonacci phyllotaxis