NUMBERS 1 TO 100
the hundred chart · primes picked out in colour
Free
MULTIPLICATION TABLE
1 to 12 · colour intensity = size of the product
Free
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
BASIC PHYSICS FORMULAS
fifteen formulas · every letter explained beneath it
Free
ANIMALS
the main branches — from comb jellies to chordates · who is actually related to whom
Free
VERTEBRATES
from lamprey to bird · and why "fish" and "reptiles" are not groups
Free
MORSE CODE
26 letters and 10 digits · dot, dash
Free
IMPERIAL UNITS
convert in your head · without a calculator
Free