through a circuit it means that we don't really need to be running this process in my local box it can be running tests or production so you could be suspecting modifying adding log statements into production code as without stopping the application this is extremely power powerful and you know with great power power comes great responsibility so use it with care the last thing that we are going to talk about it's code reviews code reviews tell us if the design of the code that we are doing if it fits the application