This mug is covered with something that looks vaguely familiar: scrawled math equations! With each one labeled in tiny letters (in case you’ve forgotten what the Balmer series looks like), there’s a formula for everyone—from the trusty one-plus-one-makes-two, to the trick for measuring how long a circle is, to physicist Max Planck’s famous quantum ratio.
Ceramic mug. 16-ounce capacity.
The Unemployed Philosopher’s Guild donates some of its profits to CJA (The Center For Justice and Accountability); Women for Afghan Women; Doctors Without Borders/Médecins Sans Frontières; New Yorkers Against Gun Violence; Kids For A Better Future; and Grist.