Disaster strikes in a New York tunnel as explosions collapse both ends of it; a combustion ensues.

Although science has not fully explained the origins of life, this clip describes how basic chemistry gave rise to living organisms.

In this Science Max Quiz, Phil explains how to differentiate chemical and physical changes. He mentions that chemical changes produce new molecules, while physical changes don't. He includes several examples of both physical and chemical changes.

This clip explains the different between chemical evolution and biological evolution.

This clip describes the Miller-Urey experiment and its purpose: to determine if complex molecules could arise from simple natural chemical reactions.