A user recently purchased a Kindle and is excited about its text-to-speech feature, particularly for reading works by Stephen Hawking. They seek recommendations for science-related texts or publications. Other users share their experiences, noting that while many textbooks are unavailable in the Kindle store, reading PDFs is common. Amazon allows PDF conversion to Kindle format, but this can be problematic for documents with diagrams and equations. Some users mention that the Kindle has a simple web browser but lacks a native PDF reader, requiring users to email PDFs for conversion or transfer them via USB. Recent firmware updates have improved PDF handling, allowing for native viewing and features like panning and zooming. Comparisons are made between Kindle and iPad, highlighting the Kindle's affordability, battery life, and readability in bright light as advantages.