Calendars are always based on astronomical manifestations of the sun (like the civil Gregorian calendar we use) or of the moon (like the Muslim calendar) because they are cyclical, fixed and may be observed. The Jewish or Hebrew calendar is lunisolar, synchronizing the holidays with the seasons and the moon phases. Prof. Ely Merzbach, of the Department of Mathematics at Bar-Ilan University, discusses the calculations and considerations that have shaped the Hebrew calendar for some 1,100 years.

Meet Dr. Carmit Altman, a researcher at Bar-Ilan University's Faculty of Education, co-founder of the "Impact Center for Multilingualism and Multiculturalism," and a member of the international research and information organization Bilingualism Matters.

On September 10, 2008, the world’s premier particle accelerator, the Large Hadron Collider (LHC), was inaugurated at the CERN Center in Switzerland. Dr. Olga Girshevitz, of the Bar-Ilan Institute for Nanotechnology and Advanced Materials (BINA), explains why the particle accelerator is such a powerful tool.