Which Scottish bacteriologist is famously credited with accidentally discovering penicillin, the world’s first widely used antibiotic, in 1928 after observing mold contamination in his laboratory?

💡 Explanation:

Alexander Fleming discovered penicillin in 1928 when he noticed that a mold contaminant, Penicillium notatum, had killed bacteria in a petri dish he had left uncovered. This accidental observation revolutionized medicine.