A documentary about the life and reign of Queen Elizabeth II, the longest-reigning British monarch in history.

一组描述夕阳下的美景和诗情画意的文字，描绘了夕阳下的自然美景和人文情怀。

A demonstration of using a slingshot to humanely kill invasive cane toads, a common pest control method in some regions.

A poignant moment of a man expressing his emotions, struggling to hold back tears.

Explore the incredible defense system of the human body, from the different jobs and components of the immune system to its response to infections and how it keeps you safe.

Footage of busy city streets on a rainy day, with people rushing to their destinations under colorful umbrellas.

Learn about the fundamental principles of electric circuits, including voltage, current, resistance, and common components like wires, batteries, and switches.