Paula Burch's Hand Dyeing on Fabric Pages Gallery and how to tie-dye, batik, and dye by many other techniques including low water immersion, dip dyeing, and sprinkle dyeing.
Background of the chemistry of dyes as examples of molecules, and the reaction between cotton and dye as a perfect example of a simple chemical reaction.
Lunar calendar with lunations, from new moon to new moon, instead of months. Moon phase on each day. Chinese, Jewish, and Islamic months. Eclipses, meteors, planets, star charts. Christian, Pagan, Islamic, Hindu, and Jewish holidays.