While listening to one of the audiobooks in English, I came across the thought expressed by Stephen Hawking that you can travel around the entire universe in your own head. I find the idea so catchy and beautiful that I experience an urge to write about it. You can be limited by your own body, but you can discover the whole world in your own head. Isn't this idea inspiring and beautiful enough in order to open the book immediately and start exploring the beautiful word first on the pages of the textbook, and then collecting enough courage to open up the possibility to explore the world on your own?