TONEWOODS
density, hardness, export · what is measured kept apart from what is taste
Free
MORSE CODE
26 letters and 10 digits · dot, dash
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