The last two books I read were Sapiens and The Supermen (given to be by @dang). Highly recommend both.

Please, you have to also tell us the authors if you really want to recommend them.

@Paul_S, I may be wrong and if it the same book I am thinking then see below. I hope this helps.

1)Sapiens (A brief history of humankind). The book authored by Yuri Noah Harari

2)TheSupermen (The story of seymour cray and the technical wizards behind the supercomputer). The book authored by Charles J. Murray.