Category Archives: Personal


I grind my teeth. Even when I’m not thinking about very difficult things – such as what present to give my mother for her birthday – I scrape the teeth of my lower jaw with my upper teeth. The dentist kindly … Continue reading

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Paraclimbing World championship – Paris, 2016

UPDATE: I ended fourth in my category. That’s less than I had hoped for, but a lot more than I had expected (I was the only Dutch finalist). The next worldchampionship (Innsbruck, 2018) I’ll do better!

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Olympic paraclimbing

Besides physics and philosophy I invest quite a lot of time and energy in sports. Several years ago a friend of mine asked me to join him to go climbing in a gym. When he saw me wavering he spoke … Continue reading

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Conference Vienna, part I – ethical asymmetry at the airport

At international conferences the university or institute hosting the conference often provides a list of hotels which are a relatively small distance from the conference site. The hotels on this list are usually neither the cheapest nor the cosiest, but … Continue reading

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Post Zero

I considered starting my first blog post with the sentence “I have a brain tumour” but I’ve chosen this sentence instead. Be that as it may, I do have a brain tumour. The tumour has caused my left body-half to … Continue reading

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