What do an ethnic Chinese, a foodie, and a computer geek have in common? Answer: Absolutely nothing! It just happens to be me! In mathematical terms, using the modern set theory: A = set of all Chinese B = set of all foodies C = set of all computer geeks There exists a subset D where: D = A ∩ B ∩ C And I am a member of set D. Or in Boolean logic: A = Chinese B = foodie C = computer geeks D = A AND B AND C Or expressed in SQL: SELECT Ethnic_group, Hobbie_interest, Profession FROM All_populati