What's new. World GK Pro is a General Knowledge app, using this app every body can know about the following details and more. The longest Rivers of the World. 1. Nile. 2. Amazon. 3. Yangtze. 4. Mississippi. 5. Ob. 6. Yenisei. 7. Yellow River. 8. Congo. 9. Amur. 10. Parana. The Most Famous Awards Around. 1. The Nobel Prize. 2. The Booker Prize. 3. The Academy Awards.