Do you really like studying?" Mattia nodded. "Why?" "It's the only thing I know how to do," he said shortly. He wanted to tell her that he liked studying because you can do it alone, because all the things you study are already dead, cold, and chewed over. He wanted to tell her that the pages of the schoolbooks were all the same temperature, that they left you time to choose, that they never hurt you and you couldn't hurt them either. But he said nothing.

Even though he was afraid to admit it, when he was with her it seemed it was worth doing all those normal things that normal people do.

Twin primes: pairs of prime numbers that are close to each other, almost neighbors, but between them there is always an even number that prevents them from truly touching. If you go on counting, you discover that these pairs gradually become rarer, lost in that silent, measured space made only of ciphers. You develop a distressing presentiment that the pairs encountered up until that point were accidental, that solitude is the true destiny. Then, just when you’re about to surrender, you come across another pair of twins, clutching each other tightly.

but his eyes were too dark for her to make out any spark in them

She emptied herself of Fabio and of herself, of all the useless efforts she had made to get where she was and find nothing there. With detached curiosity she observed the rebirth of her weaknesses, her obsessions. This time she would let them decide, since she hadn't been able to do anything anyway. Against certain parts of yourself you remain powerless, she said to herself, as she regressed pleasurably to the time when she was a girl.

The scene was set. All that was required was an action, a cold start, instant and brutal as beginnings always are.

Mattia thought that he and Alice were like that, twin primes, alone and lost, close but not close enough to really touch each other.