In 1928, scientist Alexander Fleming returned to his lab and found something unexpected: a colony of mold growing on a Petri dish he’d forgotten to place in his incubator. And around this colony of mold was a zone completely and surprisingly clear of bacteria. What was this mysterious phenomenon?

1928年，科学家亚历山大-弗莱明回到他的实验室，发现了一些意想不到的事情：一个霉菌的菌落在他忘了放在培养箱里的培养皿上生长。而在这个霉菌群的周围，有一个完全没有细菌的区域，令人惊讶。这个神秘的现象是什么？