alt Hacker NewsI used several of their books in school. Each of them was top notch.
Hell, their math books are better than the paid books I used.
I used several of their books in school. Each of them was top notch.
Hell, their math books are better than the paid books I used.
I'm glad to hear that, I just ordered their astronomy book the other day! The online/PDF material looked good but I hate diving into something unless it's on paper.