Ask HN: What are some important things to memorize?

4 points by jpiasetz 12 years ago · 1 comment · 1 min read

I've been trying spaced repetition and was curious what are some good things to always have at your fingers tips or know off the top of your head?

Ideas:

* Conversion metric to imperial * NATO phonetic alphabet * Powers of 2 * International Phonetic Alphabet