I have been reading this book for about a month now, I'm 2/3 of the way through, its a 1,200 page trilogy. I thought I wasn't going to like this SF classic at the beginning, as it's not overly 'scientific'. Themes of planetary evolution and inter species war are addressed then after a while the SF angle comes in (no spoilers!). Aldiss is a wonderfully imaginative and articulate author, I highly recommend this work. It is half the price on Kindle! I bought the heavy hard-copy, which was still reasonable priced, as I want to lend it to my son.
I am also dipping into
I wish maths was easier for me, I grasp something and it slips away again-I had originally hoped to do a physics degree with the Open University, but I had to rethink due to the maths!