the main exhibition hall houses about 200 exhibits related to different fields of science. the main exhibition was renewed completely in 1999, but there are small changes taking place in the main exhibition hall each year as well. the topics include, for example, digestion and the functions of the intestines, the production of money and traffic. the exhibition ‘the wind in the bowels’ has been designed in co-operation with the finnish medical society duodecim. the exhibition ‘about a coin’ was implemented through collaboration with the mint of finland to mark the company’s 150th anniversary.