photon_off

  - you don't have to worry about the skipped vs neutral problem (as it is fair to expect a user to answer all cards in a cardset).
  - you don't have to worry about clustering. a cardset is a "cluster".
  - you can work around technical limitations by having each cardset be its own cube
  - you boost retention by being able to have a library of dozens of cardsets (rather than 250 cards).  limitless swiping, and swiping on things that your users will find interesting because they are selecting cardsets that are important to them.
  - you can make your site viral by allowing users to send a link where the receiver can (anonymously) swipe all the cards of a cardset and see their "similarity" to the link sender.  (Then you can ask them to register to be able to send links themselves).
  - futures paths for revenue are endless

  - Politics.  Swipe left for "bad idea", right for "good idea".
  - Humor.  Swipe left for "not funny", right for "funny".
  - Food.  Swipe left for "disgusting", right for "delicious".
  - Aesthetics.  Swipe left for "ugly", right for "beautiful".
  - Hobbies.
  - Activities I want to try.
  - Places I want to go.
  - Fashion, technology, programming, ...etc...

   let name = "Jane";
   let str = s{}:John said "Don't do that, {name}!":s

   struct Person {
      user: {string name, int age},
      address: {string street, ...}
   }
   let p = new Person(<json>);
   print(p.user.age);

   arr.first();
   arr.last();
   arr[5,-5];  //5th to 5th to last