Reading history books can be useful, but the best thing is to read old books. - Paul Graham

Paying attention is more important to reliability than moving slowly. Because he pays close attention, a Navy pilot can land a 40,000 lb. aircraft at 140 miles per hour on a pitching carrier deck, at night, more safely than the average teenager can cut a bagel.

It annoys me when teachers require kids to use laborious, prescribed methods to calculate things (and to "show their work" to prove they did) because it teaches kids not to see the patterns that exist in the numbers.

The customer is always right, but different customers are right about different things; the least sophisticated users show you what you need to simplify and clarify, and the most sophisticated tell you what features you need to add.