Hi, Is there any e-reader app out there (currently using Kindle & iBooks) that can highlight any type of format? The books I buy, it's no problem to highlight and use the dictionary in Kindle. But as soon as I have a PDF from school and I need to highlight or use the dictionary, it's impossible. Please, help me and either recommend me another e-reader that is better than Kindle and iBooks or help me figure out how I can enable to use the highlight/dictionary functions. Many thanks!