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Let's make musical instruments.
This lesson presents the development of human speech and the structure and functioning of the organs of speech.
This lesson introduces some basic ideas about sound.
In this lesson you will learn about the basics of speech perception and language acquisition.
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.
A lesson about the benefits and limitations of genetic engineering.
Simple, straightforward information about the coronavirus epidemic.
Let's find solutions to the global environmental issues!
In this lesson, you will find answers to questions about the pressure of solids, liquids and gases.
How to reduce energy use at home
This lesson presents the European garden spider and the castor bean tick, two species that live at the shrub level of temperate forests.
Learn about animals inhabiting rivers, lakes and their shorelines.
In this lesson, you can learn about various herbs and spices.
The theory of relativity explained like you've never seen before.
Energy exists in many different forms. Each form can be converted or changed into the other forms.
In this lesson, you will learn about the history of food in art and the Surrealist movement.
The Renaissance, which originated in Italy, was inspired by Ancient Greek and Roman art.
In this lesson, you can learn about the famous Russian writer.