Now for something extraordinary. My grandfather Heinrich Otto Ludwig Borriss would turn 100 years on September 10, 2009.

Thanks to him I got to play with pocket calculators and later even with a Commodore 64. We discussed the 8 queens problem and travelled in 1982 to Moscow and St. Petersburg -- by train. He impressed me quite a bit and I much admire him.

There will be an colloquium at Ernst-Moritz-Arndt University Greifswald on Sep 10 and Sep 11. More pictures of Heinrich Borriss here.