====== Business ideas ======
  * furoshiki (Japanese wrapping cloth) 
    * Doubles as hijab! 🧕
  * hourglass set
  * Raspberry Pi + special OS with fun web apps and instruction manual
  * Smart lava lamp
    * lava lamps take about 1 hour to start working and need to be shut off after 6 hours
  * E-paper PDA (calendar, clock, alarms, address book, MP3 player, flashlight etc) that also serves as a offline RSS reader / pocket size ebook (use USB-C to charge/sync) 
  * Heated dakimakura
    * Like an electric blanket, but more weeb-friendly. Good for the winter. 
  * Tower of Hanoi flashcard set 
    * The classic recursive math toy, but one can insert cards with things like constellations, moon calendars, conversion tables, etc into clear plastic disks. Pragmatic.