This lesson introduces the anatomy and lifestyle of fishes through the examples of the common carp and the European catfish.
Let's follow a river's journey from its source to its mouth.
The lesson makes a thorough presentation of the period of the Industrial Revolution and of its social and economic implications.
Saving energy is a task for everyone, because the energy consumption of the Earth’s population is increasing very fast and it can soon exceed the Earth’s...
A lesson about the most important characteristics of the common earthworm.
Learn more about the early stages of human development with this lesson.
Our physical and mental health, as well as our inner harmony, determine our relationship with the external environment.
What happens when a rocket is launched? Why do we fall when the bus brakes? Let's learn about the laws of motion.
What are the types and importance of watercourses?
This lesson presents the weapons of World War I.
In this lesson you will learn about the history of fire and the conditions necessary for the combustion with flame.