new_contents: import random
  import transaction
  
  from inevitable.core import Reactor
  
  
  def callback():
      for i in xrange(10000):
          answer = i ** 3
      if random.random() > 0.00001:
          reactor.call_later(seconds=0, callback=callback)
  
  
  reactor = Reactor(clock=transaction)
  reactor.call_later(seconds=0, callback=callback)
  reactor.call_later(seconds=0, callback=callback)
  reactor.run_until_idle()
  
subject: Add a time-based example for the functionality that exists so far.