BLACK TEA
grades, six leaves and four blends · in China it is "red tea"
$1.50
TEA PLANT CULTIVARS
assamica against sinensis · leaves at one scale · six cultivars
$1.50
GREEN TEA
six leaves · water, time, number of steepings
$1.50
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
YELLOW TEA
yellowing under a cover · the step no other tea has
Free
THE ISO 3591 GLASS
the only wine glass with dimensions instead of adjectives
$2.50
SUGAR IN FRUIT
grams of natural sugar per 100 g of fresh fruit — and how much water sits beside it
$2.50
PROTEIN IN FOODS
grams per 100 g · animal and plant · and the state each one was weighed in
Free
ENGLISH ALPHABET
26 letters · 5 vowels · 21 consonants
$1.50
GREEK ALPHABET
24 letters · names and where science uses them
$1.50
NUMBERS 1 TO 100
the hundred chart · primes picked out in colour
Free