core hello world / workshop /

Yaron Minsky 996e5f2 

Yaron Minsky 1a968bf 
* Approaches to Concurrent Programming
** Two classic approaches
 - Event-loops
 - Threads
** Async
 - Best of both
 - Synchronous reasoning
 - Ability to sequence operations
 - Still cooperative (so one thread can block the world)
* A basic example
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