THE SOLAR SYSTEM
eight planets · size, distance, year and day
LOGIC GATES
Seven digital-logic symbols — and how to build six of them from a single element, NAND
DIVISIBILITY TESTS
what to read in a written number instead of dividing it: the tail, the digit sum and composite divisors
NUMBERS 1 TO 100
the hundred chart · primes picked out in colour
MULTIPLICATION TABLE
1 to 12 · colour intensity = size of the product
CURWEN HAND SIGNS
one hand for each degree of the scale, with the mental effect John Curwen gave it
MAMMALS IN TIME
from the first synapsid to us · 320 million years on one axis
VERTEBRATES IN TIME
when each group appeared · five hundred million years on one axis
BASIC PHYSICS FORMULAS
fifteen formulas · every letter explained beneath it
ANIMALS
the main branches — from comb jellies to chordates · who is actually related to whom
VERTEBRATES
from lamprey to bird · and why "fish" and "reptiles" are not groups
SI UNITS WITHOUT NAMES
the endless rest: assembled from the base and the named units, and never with a factor