PHASES OF THE MOON
eight phases · a full cycle of 29.53 days
$1.50
BITS, BYTES, KILOBYTES
two scales · 1000 and 1024 · why a drive looks smaller
$1.50
CSS FLEXBOX
main axis and cross axis · which property belongs to which
$1.50
FLOWCHART SYMBOLS
10 shapes, and one algorithm drawn with them
$1.50
HTTP STATUS CODES
five classes · twenty codes you meet every day
$1.50
THE SELECT STATEMENT
8 clauses in the order you write them — and the order they take effect in
$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