If ignorant both of your enemy and yourself, you are certain to be in peril.
— Sun Tzu
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Do you eat yogurt or drink probiotic smoothies? If so, then you may already understand that there are good bacteria and bad bacteria. The good ones live in our intestines and help digest the food we eat. Without them, we’d be dead. Bad bacteria, on the other hand, cause strep throat, cholera, diphtheria, upper respiratory infections, food poisoning, and other grim conditions.