From the Cosmic Variance blog http://physicsweb.org/articles/news/9/9/8/1 http://news.bbc.co.uk/1/hi/england/cambridgeshire/4255806.stm http://en.wikipedia.org/wiki/Hermann_Bondi (I see now that there was a post in GD by neutrino several days ago. I think that posting here might bring more attention to his passing.) Besides his work in cosmology, Bondi popularized the "k-calculus" radar-method presentation of Special Relativity. (See, for example, http://www.geocities.com/ResearchTriangle/System/8956/Bondi/intro.htm ) In my informal survey of physics education papers on relativity, Bondi's method is used more (or known better?) in the UK than in the US.