OOLONG
from 15 to 80 % oxidation · leaf shape · seven steepings
$1.50
SIX KINDS OF TEA
one plant · the oxidation scale · seven processing steps
$1.50
THE HAMBURGER
the ratios of the mince and the five steps that decide the result
$1.50
ENGLISH ALPHABET
26 letters · 5 vowels · 21 consonants
$1.50
GREEK ALPHABET
24 letters · names and where science uses them
$1.50
THE CLOCK FACE
two hands, twelve numbers — how to read the time
$1.50
ROMAN NUMERALS
seven symbols · ones, tens, hundreds · years
$1.50
BARRE CHORDS
two shapes, twelve chords each
$1.50
FIRST CHORDS
15 chords every beginner starts with · standard tuning E A D G B e
$1.50
THE KEYBOARD
three octaves · every key and its note on the staff
$1.50
THE TREE OF LIFE
who sits inside whom · where animals, fungi and plants actually are
$1.50
SI PREFIXES
from quetta to quecto · twenty multipliers
$1.50