Christian Hubicki on X: "My office whiteboard has been used for the same Quadratic Programming lecture so many times I might as well leave it be and buy a second white board.
XIWODE Magnetic White Board Dry Erase Board ,Hanging Whiteboard ,36 x 24 inches(WxH), With Silver Aluminium Frame And Pen Tray,Whiteboard Pen, Magnet, Eraser,Suitable For Home, Office, School - Walmart.com