Detailed Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: Three objects known by this term are collectively used to represent spin operators are named after Wolfgang Pauli. Calcium is deposited in an area of bone tissue known by this term, which generally describes any part of tissue that does not contain cells and also describes a part of the mitochondrion where the Krebs Cycle occurs. In mathematics, objects denoted by this term can only be multiplied if the number of columns in the first equals the number of rows in the second. For 10 points, name these rectangular arrays of numbers.
A:
Science