Bacteria that survive extreme temperatures

Proper cooking will kill bacteria in raw food such as raw meat/poultry and make the food safe. And I always thought cooking at high temperatures such as boiling, will kill all the bacteria and prevent food poisoning.

Guess what I learn in my recent trip to Yellowstone? There are bacteria which can survive extreme temperatures. These are otherwise know as Thermophile. Thermophiles are found in various geothermally heated regions of the Earth such as hot springs like those in Yellowstone National Park and yes...we saw orange-brownish bacteria mats at Grand Prismatic Spring, in Midway Geyser Basin.















At first, I thought it was "rust" caused by the hot temperatures and presence of moisture oxidizing the mineral and metals.