== Removing old and invalid comments on talk page == 

 Hello DMacks,   I'm working on the Inverted Repeat article as part of a Molecular Biology course at JHU.  I removed an old, out-of-date (2 years old) and misleading talk-page comment and I noticed that you preformed an "undo".  Is there a problem with removing old talk comments that cause issues because 1) the person didn't sign their post so there is no way to resolve with them and 2) the issue raised is invalid (the person didn't understand the concept) and 3) the issue was raised more than 2 years ago. 
 Thanks,