Digital Teaching and Learning from FCIT at USF is a collection of tools, resources and VEO. Included is a collection of education Apps for use with the iPad and/or iPod. The items may be sorted by grade, subject, cost, and more. I took a look at 101 Science. A convenient "take me to it" button will bring you to the information available via the iTunes store. Many free and low cost App solutions for the classroom.