Brush your teeth every day, why do you still have cavities?

There must be such a sentence in the top 10 question often asked by dentists: “Doctor, I brush my teeth every day (I don’t like sugar). Why do I have cavities?” Yeah, why? You know, teeth are the hardest and wear-resistant part of the body. How can they decay? Every drop of water wears away …
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How to decipher the “smart action” of bacteria?

In March 1968, in Texas, USA, scientists Ellis Kempner and Frank Hansen were confused about how a bacteria from the ocean (now known as Vibrio fischeri) glows .  Bioluminescence is widespread in nature and can be used to attract mates, lure prey, and deter predators. Most animals that emit light live in the ocean, and …
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