This week, issue number 100 of Geologiskt forum is distributed. The first issue of the magazine saw the light of day in March 1994. It was then something of an experiment, but in retrospect we can conclude that the experiment was quite successful. We hope you will find something in this issue that can interest you and would like to wish you a Merry Christmas and a Happy New Year. If you are a member you can, as usual, also download the issue here on the website.