PHASES OF THE MOON
eight phases · a full cycle of 29.53 days
SERUM ACTIVES
when to apply, what to keep apart in time, what the season changes
BITS, BYTES, KILOBYTES
two scales · 1000 and 1024 · why a drive looks smaller
FLOWCHART SYMBOLS
10 shapes, and one algorithm drawn with them
HTTP STATUS CODES
five classes · twenty codes you meet every day
POST-FERMENTED TEAS
six teas changed by microbes rather than oxygen
PUERH AGEING
sheng and shu · what the years do and when to drink
BLACK TEA
grades, six leaves and four blends · in China it is "red tea"
GREEN TEA
six leaves · water, time, number of steepings
OOLONG
from 15 to 80 % oxidation · leaf shape · seven steepings
SIX KINDS OF TEA
one plant · the oxidation scale · seven processing steps
ENGLISH ALPHABET
26 letters · 5 vowels · 21 consonants
GREEK ALPHABET
24 letters · names and where science uses them
ROMAN NUMERALS
seven symbols · ones, tens, hundreds · years
THE KEYBOARD
three octaves · every key and its note on the staff
THE TREE OF LIFE
who sits inside whom · where animals, fungi and plants actually are
SI PREFIXES
from quetta to quecto · twenty multipliers