This time:

• Allow deleting greetings (fixed the bug where tests froze because of a lock in test code)
• Renamed "greeter" to "greet"
• Got properly confused trying to pause for a random time before greeting

Next time:

• Figure out how to provide a random number to the callback function (so we can sleep for a random time) without needing the schedule to be Sync
• Or in other words, try to become less confused (briefly, I imagine)