Crowds outside Manchester Airport after bomb scare

What is the primary focus of the '2nd' concept introduced in the video?

• A grammatical rule

• A scientific principle

• A new mathematical theorem

• A historical event

What is the key takeaway from the '2nd' concept as concluded in the video?

• It is a basic principle in scientific studies

• It is essential for understanding historical contexts

• It is a crucial element in understanding modern technology

• It is a fundamental concept in biology

Which example best illustrates the '2nd' concept discussed in the video?

• An example from physics

• An example from literature

• An example from chemistry

• An example from mathematics