Book Creator (BC) is an iPad app, and iBooks Author(IBA) is a Mac program. Both allow the teacher (or student) to create beautiful ebooks. Students can represent their learning; teachers can assemble mini-texts for their classes.
BC is more limited in its possibilities, but is extremely easy to use. Students can create impressive picture books that can be read in iBooks or the Kobo and Bluefire reader apps. Pictures and drawings can be easily imported. Asking students to look at layouts and presentation styles in existing picture books will make the final product that much more satisfying. (some samples here. FAQ)
IBA is a free Mac OS program that lets the user build very sophisticated eTexts incorporating video, photo galleries, 3D models, html widgets and links to external sites. A handful of templates included in the program will get you started but you can browse for "iBook Author" themes and download some for free. (Tips and tricks here.)
I was just at an Apple Learning event and explored the "Pyramids" app. This would make a great virtual "field trip" for a class. Even if you can't afford a copy for a class set, use a projector with a single download and explore as a class!
"The greatest monuments of ancient Egypt are brought to life on the iPad screen in this immersive, navigable 3D world. Uncover the fascinating story of history's greatest treasures by exploring Egypt's famous pyramids and tombs within an interactive view of the Giza plateau."
When you first set up your Twitter account, you only had a moment or two to decide on a Twitter handle (or "user name"). This is the name that appears after the @ sign. A clever nickname or cryptic acronym may have fit your needs at the time but now you want to change it to something else. Is it possible? Yes, read Brandon Widder's primer on how to rename your Twitter presence without losing your followers or your tweets.