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
THE HAMBURGER
the ratios of the mince and the five steps that decide the result
$1.50
SUGAR IN FRUIT
grams of natural sugar per 100 g of fresh fruit — and how much water sits beside it
$2.50
NEAPOLITAN PIZZA DOUGH
four ingredients in the proportions written into an EU regulation
Free
POUND CAKE
four equal weights — a recipe whose name is its ratio
Free
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
THE VERTICAL PLANET
from the Challenger Deep to the summit of Everest · one scale, nothing compressed
$1.50
MAMMALS IN TIME
from the first synapsid to us · 320 million years on one axis
Free
VERTEBRATES IN TIME
when each group appeared · five hundred million years on one axis
Free