THE SOLAR SYSTEM
eight planets · size, distance, year and day
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
THE BASKETBALL
four FIBA sizes with their circumference and mass — and why the rules set a bounce, not a pressure
Free
BALLS BY THE RULES
eleven sports at true relative size — circumference, mass, pressure, and who sets them
Free