Today's fun fact corner! Today is about the origin of 'Calpis.'

Literal

Today [possessive-の] trivia corner! Today [topic-は] 'Calpis' [possessive-の] origin [about-について].

豆知識 (trivia, literally 'bean knowledge') is a popular term for bite-sized facts. コーナー (corner/segment) is a loanword for a regular feature. カルピス is a beloved Japanese milk-based soft drink. The sentence is a casual introduction with an exclamation mark and a verbless second clause.