Quick quiz #251.

This document is a collection of quizzes and brain teasers from the New Scientist journal. It includes a quick quiz with questions about asteroids, sparrow species, star clusters, Alzheimer's disease, and structural terminology. There is also a brain teaser about calculating interior angles in regular polygons and arranging them around a point. Additionally, the document provides answers to a quick crossword puzzle and a previous brain teaser. The content is aimed at engaging readers in scientific and mathematical thinking. [Extracted from the article]