Aerial footage of New York City's grid-like streets and rectangular buildings creates a visual resemblance to a plate of ravioli.

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

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.

The U-44 was a German U-boat that served in World War I, part of the U-43 class of submarines.

Learn how to safely and effectively fire a gun without revealing your position or identity.

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

Discover the basics of hydroponics in this 1-day training course, covering soilless growing methods, system design, and plant care.