What are columnar joints? Are these features even natural? How do they form? This video will delve into some history, processes that form these amazing geologic features, and a short rundown of some key scientific papers that help shape our understanding of columnar joints.

Created by Gina Sarkawi for ES3002/ES7012 Structural Geology and Tectonics, ASE-NTU, Singapore

Have you ever wondered why or how your joints pop? In this video, I explain the physiological mechanism underlying the cracking or popping of joints such as those in the fingers or neck. The exact reasons may surprise you.