Part 2/15:
The speaker introduces the context: a controversy sparked by a channel called Don't Sphere the Truth (DST), which responds to claims questioning Earth's curvature. In particular, DST aims to explain why objects at the horizon appear to disappear from bottom to top, attributing this to mirages caused by atmospheric conditions like inferior mirages. The speaker emphasizes the intention to critically evaluate this explanation, especially regarding objects over water and land, and to clarify the scientific consensus about Earth's shape.