This lesson presents the development of human speech and the structure and functioning of the organs of speech.
Let's make musical instruments.
Find out interesting pieces of information about the communication of animals.
Noise surrounds us everywhere, but it can be harmful. Let's see how.
This lesson helps you understand the process of hearing.
In this lesson you will learn about the basics of speech perception and language acquisition.
This lesson introduces some basic ideas about sound.
Simple, straightforward information about the coronavirus epidemic.
Let's find solutions to the global environmental issues!
Numerous insects live on tree trunks, in the foliage and on the ground. Let's learn about some species.
In the body, substances are continiuously absorbed and released.
In this lesson, you will learn about buoyancy and the conditions of floating for objects.
In this lesson, you will learn how mountains are formed.
Apartments are like living organisms, there is a constant exchange of energy and materials between apartments and the environment.
Humans produce an increasing amount of waste. A change in our lifestyle could significantly reduce the production of household waste.
In this project, you will perform experiments with water.
A lesson about the changes that take place in our bodies throughout our lifetime.
Let's learn about the various types of worms by looking at the characteristics of typical species.
Albert Einstein’s life is surrounded by numerous legends, but the facts about him are also quite interesting.
There are plenty of weeds and herbs on fields, agricultural areas and even in carefully tended gardens.