3.1 v2.16.22a (8/11/2014)
- NMJ can no longer learn -- instead, a message is displayed
- Sensory neuron can no longer be constitutive/spontaneous
- Current charge indicator (numeric) added to threshold meter to report current charge level
- Learning at an inhibitory synapse now displays red neurotransmitter (animation and canvas)

3.1 hotfix (7/16/2014)
- NT Vesicles no longer swell upon learning -- size is unchanged

3.1 (7/6/2014)
- Made the NT release of a learned pre-synaptic neuron more pronounced

3.1 RC 3 (5/28/2014)
- Zoom2Learn changes:
  * Muscle can now display Z2L animations (NMJ support)
  * Ca2+ channels in presynaptic neuron removed
- Fixed axis desync in Flash throttle mode (pauses when throttling)

3.1 RC 2(5/25/2014)
- Zoom2Learn changes:
  * Reworked vesicle animation: larger (rather than more) vesicles on learn
  * EPSP (puff) now reliably appears with each firing event
  * Puff size now depends on learn status
  * Contact gap removed between NT and top spine (NT now lands properly)
- "Zoom In..." button now shows active regions for easy synapse identification
- Neuron adder & changer now close if an empty area is clicked ("clicking out")
- Added a tip for neuron removal (shown on first drag/touch)

3.1 RC (5/9/2014)
- Added baseline firing
- Added looping animation
- Fixed a small bug in the "back" handling code

3.1 alpha 2 (2/23/2014)
- Added Z2L text hint
- Numerous tweaks to the animation
  * Some NT now misses the post-synaptic neuron (more realistic)
  * Added clock animation to show passage of time before learning happens
  * Vesicles regenerate, NT degrades properly after firing animation
  * New dendritic spines now appear during learning
  * Pop-in now used to show "new creation" -- fading shows "animation reset"

3.1 alpha 1 (1/20/2014)
- Neurons are now draggable by any active region (addresses "tiny drag zone" finger dragging issues)
- On-screen messages are now added to alert users of problems or instructions when changing neurons, zooming, etc
- "Delete" button has been removed due to its tedious nature 
  * To delete, drag a neuron into the sidebar
  * Added deletion animation
- Zoom2Learn extension integrated (its button is in place of the old "Delete")
  * "More NT learning mode" animation has been added
  * Neurons under this learning type display increased NT release in the canvas, too
  * Neurons adaptively unlearn when learned synapse broken, restore former animations/threshold when completely broken
- Misc. bugfixes and performance optimizations

Release (10/10/2012)
- A few misc. bugfixes

RC1 (9/12/2012)
- Fixed regression in motor neuron NT color (now green again)
- Code trimming
- Graph renders up to 100x faster while scrolling
- Faster particle calculations, constant-time muscle twitch animation
- Tried to fix some very rare lingering bugs dealing with click event listeners spontaneously failing to listen
- Mobile version: pause on deactivated, close when "back" button pressed, minor GPU optimizations

Beta 2 (8/30/2012)
- Smoother, more fluid animations for discharge and muscle twitch
- Reduced resource consumption for mobile devices (a little more to come)
- Motor neuron discharge now blue (greatly mitigates confusion with the "green" discharge from/between other neurons having completely different targets)
- Mobile devices now don't fall asleep when the program is left to run for over a minute

Beta 1 (8/19/2012)
- Skin animation (from short-lived interim "alpha 3")
- Changed skin/pin animation behavior: pin fades in/out on pause/resume, resets (w/skin) on reset/restart; stays in skin otherwise
- fixed bug that caused a pending muscle to complete its twitch immediately following data reset
- addressed a potential problem in the android (Air) build that could result in unusable canvas after multiple resets/restarts
- Android build: attached and on development site
- Desktop build: installer, on development site

Alpha 2 (8/8/2012)
- Removed most debugging shapes
- Enlarged receptive region on motor neurons and muscle
- Fixed issue with doublet discharge and sporadic discharge times on inhibited spontaneous neurons
- Android app released (works on all Android tablets/phones with Cortex-A8+ processors, maybe others)
- Simplified/organized non-advanced palette
- Clarified reset functionality - master reset now called "Restart" and a "tap-to-reset" message added to time display area
- Graph auto-scrolling
- Twitch count now updates without delay instead of at end of cycle
- Fixed a case when changing an inhibited spontaneous neuron's threshold does not reactivate it

Alpha 1 (7/31/2012)
- Graphs implemented and added
- Some GUI cleanups
- Removed debug scrolls
- Added "backwards" inter neuron (default canvas in advanced mode, also in "Change" menu in advanced mode)
- Added inhibitory inter neuron to top-right of default canvas (both basic and advanced)

Pre-alpha 2 (7/28/2012)
- fixed numerous GUI bugs/glitches/misbehaviors
- added button feedback (very useful on mobile devices)
- locked neurons to draggable area (when dragged out of it or behind the toolbar, they'll follow your mouse/finger until you click somewhere valid)
- "Enable advanced neurons" now has an extremely pronounced effect, both on starting canvas and shapes available under "Change..." for each neuron type
- tweaked muscle twitch animation for better performance on mobile devices
- hopefully ironed out the last of the meter bugs

Pre-alpha (7/20/2012)
- credits screen 
- some visual changes 
- ap threshold meters
- preliminary muscle twitch animation
- click time/twitches to reset them (and graph in the future)

Testing phase (7/6/2012 - 7/20/2012)
- Misc GUI fixes (checkmark still wasn't clickable in options, changed back to seconds, one scaling fix...there's a lot more to do!)
- Fixed screen transition -- now clicking out of credits brings up the main screen again as expected
- Many new stubs, some of which are somewhat functional
- Options screen actually does something now -- shows and hides meters
- Meters implemented (merged)
- User removal of meters, updating of meters, meter rollover, realtime interaction, dynamic meter addition when neuron removed, etc

Proof-of-concept 2 (7/5/2012)
- Add, remove, change neuron functionality now working

Core stage (6/20/2012 - 7/4/2012)
- Implemented overlap detection and charge processing
- Deep core code optimization
- Basic UI (buttons don't yet do anything)
- Settings menu w/toggles (they don't yet do anything)
- Increased accuracy and fidelity of timing and overlap code

Playground stage (6/15/2012 - 6/20/2012)
- FLV compression and resource optimization
- Modularization, code review, and housekeeping
- added a couple of simple animations to the start screen
- Implemented dynamic background color control
- Added numbers to each neuron, named each neuron instance (automatically) after its number, tied number to class
- wrote up a demo with a few more neurons on the screen

Planning stage (6/10/2012 - 6/14/2012)
- Some pseudo-code and GUI concept design created
- Ripped neuron artwork (with subtle changes) from VN2
- Basic start menu