The only Finnish word to make it into everyday English is "sauna". But what it is, and how much it means to Finns, is often misunderstood - and it's definitely not about flirtation or sex.
In a dimly lit wood panelled room, naked men sit in silence, sweating. One beats himself repeatedly with birch branches. Another stands, takes a ladle of water and carefully pours it over the heated stones of the stove in the corner.
There is a hissing noise.