When you are in the jungle delivering Good News and water filters to the people who could use both, there is sure to be resistance. But fighting mosquitoes can certainly get in the way!  Has anyone used the app, Anti Mosquito Repellent Sound?  Supposedly it aims to help you to fight against annoying mosquitoes with low frequency sounds.  It is an app which is completely free.  Try it out at your next family barbeque and let us know how it works out for you.  Other tips? Please comment.