AboutThisDay.com is a date based 'on this day in history' style search engine of facts like births and deaths of people, events and holidays. You can refine the results using year range and category filters and the results are sorted using a home-grown popularity algorithm
M. Viswanathan, T. Whangbo, K. Lee, und Y. Yang. ICCS '07: Proceedings of the 7th international conference on Computational Science, Part III, Seite 701--708. Berlin, Heidelberg, Springer-Verlag, (2007)