multiply 111,111,111 by itself, you get the rather pleasing 12,345,678,987,654,321

— Matt Parker, Things to Make and Do in the Fourth Dimension

The lesson here is that the narrower you can make your product while still maintaining a large enough market, the more profit you will generate. It’s that simple – if you can find a small group of people and make them amazingly happy, you will make money.

— Rob Walling and Mike Taber, Start Small, Stay Small

French mathematician Edouard Lucas (1842–1891) did actually prove that every even perfect number must end with 16, 28, 36, 56, 76, or 96

— Haim Shapira, Eight Lessons on Infinity

For me, technical direction is a reminder to care daily about my work. Growth is actively watching my career and making sure that today is not a dull repetition of yesterday. Finally, delivery is my daily investment in my reputation.

— Michael Lopp, Being Geek

You must be honest about the constraints that are making the challenge difficult, which almost always include people and organizational aspects that are uncomfortable to acknowledge.

— Will Larson, An Elegant Puzzle