Popular Science Journey Through The Earth’s Centre (Urdu) Dr. Pervez Hoodbhoy March 13, 2021 Imagine drilling a hole so deep into the earth so that you come out on the other side. How long will it take and how fast will we be moving? And why is physics so similar to that of the simple pendulum? Let’s learn from Dr. Pervez Hoodbhoy. Watch it in English here.