Think that swatting mosquitoes is just a waste of time? A new study published in the journal Current Biology suggests that swatting mosquitoes teaches them to avoid a person--who they can identify by scent for several days after the lesson. "Once mosquitoes learned odors in an aversive manner, those odors caused aversive responses on the same order as responses to DEET, which is one of the most effective mosquito repellents," explains researcher Jeffrey Riffell. "Moreover, mosquitoes remember the trained odors for days." The finding could prove important to helping control mosquitoes and prevent mosquito-borne diseases, according to the researchers.