Think our winter's been a bit grim? Try visiting Yakutsk – the Russian city where 'a bit nippy' means minus 50C, and a quick dash to the corner shop could end in frostbite.
At minus 5C, the cold is quite refreshing and a light hat and scarf are all that's required to keep warm. At minus 20C, the moisture in your nostrils freezes, and the cold air starts making it difficult not to cough. At minus 35C, the air will cold enough to numb exposed skin quickly, making frostbite a constant hazard. And at minus 45C, even wearing glasses gets tricky: the metal sticks to your cheeks and will tear off chunks of flesh when you decide to remove them.