CDC website concentrates really useful information about health issues in different parts of the world (including my country, Peru). I've read it and found it accurate and useful for people who want to travel internationally.There are also Podcasts with great listening material.
Teachers these days need to organize great presentations and this is an awsome tool. Explore it! You can use old PPTs presentations, zoom important areas and update them by using Prezi.
Regards
EMMA