PHASES OF THE MOON
eight phases · a full cycle of 29.53 days
$1.50
THE SOLAR SYSTEM
eight planets · size, distance, year and day
Free
BITS, BYTES, KILOBYTES
two scales · 1000 and 1024 · why a drive looks smaller
$1.50
FLOWCHART SYMBOLS
10 shapes, and one algorithm drawn with them
$1.50
HTTP STATUS CODES
five classes · twenty codes you meet every day
$1.50
NINE DRINKS
the same coffee, different proportions
$2.50
ARABICA AND ROBUSTA
two species, six varieties, one difference
Free
POST-FERMENTED TEAS
six teas changed by microbes rather than oxygen
$1.50
MATCHA GRADES
ceremonial, premium, culinary — what is behind the words
Free
PUERH AGEING
sheng and shu · what the years do and when to drink
$1.50
BLACK TEA
grades, six leaves and four blends · in China it is "red tea"
$1.50
GREEN TEA
six leaves · water, time, number of steepings
$1.50