Uncertainty played a role not only in Heisenberg's discoveries in quantum physics, but also in his life.
Learn about the middle and final sections of the digestive system.
Learn about Simeon I the Great, a legendary figure in Bulgarian history.
In this battle, Simeon I won a great victory over the Byzantine army.
In this lesson you can learn about the vision of humans and animals as well as the perception of colours.
Learn about the life and works of the renowned Bulgarian poet and novelist who is often called the 'Patriarch of Bulgarian literature'.
In this lesson, you will learn about the life of a significant Bulgarian writer.
In this lesson, you will learn about one of the greatest masters of Bulgarian science-fiction.
The rose is one of the most beautiful and most common ornamental plants. Learn about its characteristics.
In this lesson, you will learn about the natural and social geography of Madagascar.
Learn about the life of Stefan Stambolov.
The aqueous solution of hydrogen chloride gas, known as hydrochloric acid, is a commonly used chemical in laboratories.
Vasil Levski was one of the greatest figures in Bulgarian history, a national hero and revolutionary, who played a key role in achieving Bulgaria's independence.