A cool trick with hot water at -40C
Extreme world is a new season of coverage on TV, Radio and Online, examining the global differences that divide us. Over the next few months BBC News correspondents will be exploring eight key themes that illustrate the contrasts in our extreme world.
For the first theme, Hot and Cold, BBC News visited the Russian village of Oymyakon in Siberia, officially the coldest inhabited place on Earth.
In Omyakon the average January temperature is -46C and frostbite is a constant hazard but the region is rich in gold and diamonds - and Russia is now one of the world's leading diamond producers.
Adam Mynott looks at some of the challenges faced by those living there - and finds out what happens to a cup of hot water when thrown in the air at -40C.