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

Debunking the myth: Space Shuttles were designed for low-Earth orbit, not lunar missions. Explore the facts behind the Space Shuttle program.

Watch as a Moai statue is carefully rotated to its original position, showcasing the intricate details of this ancient Easter Island monument.

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

习惯可以改变一个人，好的习惯让我们变得更好，坏的习惯让我们不由自主。如何养成好的习惯，改变自己？

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.