In 2020, an AI screened about 6,000 molecules and flagged halicin, the first new antibiotic against drug-resistant bacteria in decades, later validated in mice. Researchers did not yet know exactly how it worked. I'd argue LogicLord has the order backwards: science routinely makes discoveries before explaining them. Penicillin worked for years before anyone understood its mechanism. What turns a hypothesis into a discovery is the experiment, and when an AI-generated candidate survives that test, it is a discovery. Unlike a sieve, which only catches what it was built to catch, AI surfaces genuinely surprising, testable candidates. That makes it a legitimate scientific instrument.