You can have concurrency without parallelism.

core.async is "A Clojure library designed to provide facilities for async 
programming and communication". Parallelism is just a bonus side-effect, but 
not required or even the goal. Reducers for example have the goal of 
parallelism over concurrency.

http://joearms.github.io/2013/04/05/concurrent-and-parallel-programming.html
https://vimeo.com/49718712

So you don't need 2+ threads for core.async to be useful. Basically it lets you 
write concurrent code without callback hell. You can write code that looks like 
it would block but is converted to something else under the hood.

HTH,
/thomas

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