Assertion: elf's people | /r/CapableOf | believe in santa claus
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text: Papa Elf makes him his apprentice and explains that he repairs the "Kringle 3000, 500 Reindeer-Power" jet engine on Santa's sleigh, which he invented in the 1960's when the Christmas spirit that powers the sleigh started declining after people started to stop believing in Santa Claus, forcing him to build the engine to assist Santa.
text: It’s established early on in Elf that Santa’s sleigh used to run on Christmas spirit alone, but since fewer people believe in Santa Claus now, the sleigh is assisted by an engine crafted by Papa Elf (Bob Newhart).