 This is a very popular and well-known book among sci-fi fans. I found it to be not nearly as good as its reputation, but it's worth reading, it's okay. The idea is you've got this guy who was one of the first people recruited into the space marines and because of all the interstellar travel between battles and all the time dilation involved he ends up living many centuries. It's very Starship Troopers, very Heinlein. The one unique concept about the book that I thought was the most interesting was the idea that when you would attack the enemy planet with your space battleship and then you would fly back to Earth with your interstellar drive that was traveling a good fraction of the speed of light during the decades that you're traveling the enemy has decades during which to develop a new kind of space drive that can travel a greater percentage of the speed of light and they can therefore catch up with you in flight. So both sides are taking turns being attacked by battleships from the future? That was a neat way of looking at it, I thought. You can support 30 Seconds Sci-Fi and my other projects by becoming a patron. There's a link in the description below. And visit the 30 Seconds Sci-Fi Tumblr, that's my headquarters. In addition to my videos I publish links and updates there every day.