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Web the thames & kosmos science advent calendar. Shop all thames & kosmos. View all available formats & editions. Web $49.95 when purchased online. Web celebrate the winter holiday season with advent calendars from thames & kosmos! Web with this advent calendar, children open a new box each day to find new equipment or materials and the instructions for a. Do one experiment every day with our. 661007 stem science advent calendar 2023.