One was pink in the center, and one was brown. Shoppers were asked to choose the one they thought was cooked properly to the correct temperature. Most picked the brown hamburger, using the color assumption. But the meat thermometer showed the pink hamburger was the safe one. This serious strain of bacteria is killed when foods are heated thoroughly, but can cause serious illness or even death if not cooked to a high enough temperature.
Burgers can brown prematurely for a number of reasons.
Meat from carcasses of older animals exposed to air can appear brown before it is fully cooked. So can meat that is stored above proper temperatures for too long a time. For those reasons, it's probably a good idea to invest in a digital, instant-read thermometer. Supplements are vitamins, minerals, herbs, amino acids, and practically anything else that is not considered a food or a drug. They are sold in grocery stores, health food stores, drug stores, and discount stores.