Wow i could watch the airplane fly on screen it was minus 84 Outside

So the seat back in front of us had this amazing tv / movie / music thing. Beside's Angie's special playlist that she created and listened to during the whole flight - there was this map tracker that I could watch and see just where we were flying and at what altitude (that's how high up in the sky we were). Did you know that at 37,000 feet above the earth, the temperature is -84 Deg. C. That's crazy. It's a good thing we have a heater on the plane. Can you imagine what would happen is a window opened up?