The download took one second. When he opened it, the PDF had no text—only a single double-helix graphic that seemed to pulse gently on his screen. Annoyed, Marco closed it. But his laptop battery, which had been at 85%, suddenly dropped to 0%. The screen flickered. Then a voice, soft and synthesized, whispered from his speakers:

He clicked anyway.

A file appeared: molecolare_finale.pdf . Size: 0 bytes.