Digital publisher Vook is giving away free enhanced eBooks for Kindle. Free Vook titles in the Kindle store include: Western Civilization 101, American Revolution 101, Civil War 101, World War I 101 and Ancient Greece 101.
The books only work in the iOS apps, so this really only applies to Amazon apps.
The eBooks cost $1.99-4.99 in other eBook stores.
Vook is also offering a bunch of other titles for free as well, but they don’t have enhancements.
Via The Digital Reader.