Weihnachten customs held upon returning from church leading to the gift giving vary across the German-speaking countries. One of the most common situations sees the returning children wait to enter into their (locked) living room until a little bell rings. This bell marks the departure of the one delivering gifts. In the more Catholic regions - primarily South Germany and Switzerland - this is considered the Christ Child ("Christkind"), while those in North Germany commonly consider it to be the "Weihnachtsmann" (Saint Nicholas or Santa Claus) who is exiting. The children then enter to see the decorated Weihnachtsbaum (Christmas tree), with
Emmanuel David Tannenbaum Bose–Einstein condensate. Emmanuel Tannenbaum received a number of honors including the Robert Karplus Prize in Chemical Physics from Harvard University, the prestigious Alon Fellowship from the Israel Academy of Sciences and Humanities, and a National Institutes of Health research fellowship. Dr. Tannenbaum is the son of mathematician Allen Tannenbaum and chemist Rina Tannenbaum. His sister, Sarah Tannenbaum-Dvir, is an oncologist/hematologist. Emmanuel David Tannenbaum Emmanuel David Tannenbaum (June 28, 1978 – May 28, 2012) was an Israeli/American biophysicist and applied mathematician. He worked as a professor and researcher in the Department of Chemistry at the Ben-Gurion University of the Negev and