SERUM ACTIVES
when to apply, what to keep apart in time, what the season changes
$1.50
THE HAMBURGER
the ratios of the mince and the five steps that decide the result
$1.50
THE CLOCK FACE
two hands, twelve numbers — how to read the time
$1.50
ROMAN NUMERALS
seven symbols · ones, tens, hundreds · years
$1.50
BARRE CHORDS
two shapes, twelve chords each
$1.50
FIRST CHORDS
15 chords every beginner starts with · standard tuning E A D G B e
$1.50
THE KEYBOARD
three octaves · every key and its note on the staff
$1.50