Khan/khan-exercises — pull request #21095 by beneater (2012-05-03 00:33:38+00:00)
Title: create() calls activate(), so activate() should be defined before the call to create() is queued

In the unlikely event MathJax isn't slow, it seems like `create()` could get called before `MathJax.Hub.Queue(function() {create(0);});` returns. Since `create()` calls `activate()`, this fails since `activate()` isn't defined yet.

@spicyj review