TODO


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Math

General
+ Improve overall performance.
+ Improve user feedback for Drag & Drop via keyboard.
+ Progress only when right answer is given.
+ Fix bug: line segment drop area sometimes stays highlighted.
+ Add sound effects.
+ Improve images of faucet, balance, scissors
+ Animate pouring of water, cutting by scissors, maybe motion of balance.

Compare3 Lesson
+ Control movement from one problem type to another.
+ Add more problems for some comparisons.
+ Make something happen when progress is completed successfully.
+ Display intersection between Shapes in a different color.  IntersectionObject maybe?
- Mass comparison: fit into answer box.
- Fix drawing of mass parallelopipeds (ThreeDObjects).
+ Volume comparison: fit into answer box.
+ Amount comparison: fit into answer box (maybe make wider and reposition).
+ Amount comparison: refine appearance of object groups.