There is some confusion about the nationality of the Belgium-born Dutch astronomy professor M. Minnaert (author of ‘Light and Colour in the Open Air’). Historically, the best way is to call him either a ‘Dutch astronomer’ or a ‘Belgium-born Dutch astronomer’.
The genetic relation between humans via their sex chromosomes differs from that via the other chromosomes. One of the consequences is that sisters are genetically more closely related with each others than with their mother or their own daugthers.
A simple argument shows that for a kinships farther away than 6 genetic steps the biological relation becomes negligible. This holds, among other examples, for third cousins and beyond, and for 7th or higher degree ancestors.
At the IAU meeting of December 2009 Minor Planet 12157 (an asteroid) received the name Können, after me. Its diameter is about
I was invited by ESA to stay at the European Space Operation Centre in