Physics Simulations with Ember
As a first stab, I made a single pendulum aka a Harmonic Oscillator:
When I was an undergraduate I toiled on a final project related to the Lagrangian for my Classical Mechanics for a couple weeks, and a large part of that was programming a double-pendulum simulation in a java applet. It took me about 2 weeks to make it back then. When I tried to do this in Ember it took me about 1 hour. That's progress.