Azot (N₂) (nivel începător)

Azotul este un gaz incolor, inodor și nereactiv, care constituie 78,1% din atmosfera...

Monoxid de carbon (CO) (nivel începător)

Gaz inodor și incolor; în concentrație mare este foarte toxic pentru oameni și animale.

Dioxid de carbon (CO₂) (nivel începător)

Gaz inodor și incolor, mai greu decât aerul, necesar pentru fotosinteza plantelor.

Oxigen (O₂) (nivel începător)

Cel mai răspândit element de pe Pământ, indispensabil vieții.


Cometele sunt corpuri cerești spectaculoase care orbitează în jurul Soarelui.

Electric motors

Electric motors are present in many areas of our lives. Let's learn about the different...

The Cassini-Huygens Mission (1997-2017)

The Cassini spacecraft was exploring Saturn and its moons for nearly 20 years.

B-24 Liberator

The B-24 Liberator was an American heavy bomber aircraft, built in large numbers, that...


Icebergs are small or large blocks of frozen freshwater floating in the sea.


The Moon is the Earth's only satellite

Ictíneo II submarine

The submarine designed by the Spanish inventor Narcís Monturiol was a pioneering work in...

How does it work: PET-CT

By positron emission tomography (PET), we can obtain visual information on the internal...

Bone structure

This scene explains the structure and functions of the bones.

The adrenal glands

The adrenal glands are responsible for maintaining homeostasis and producing a rapid...

Quetzalcoatlus, a giant pterosaur

Quetzalcoatlus was one of the largest known flying animals of all time.

Bacteria (advanced)

Bacteria are unicellular organisms that have no cell walls and are a few micrometres in...

The structure of prokaryotic and eukaryotic cells

There are two basic cell types: prokaryotic and eukaryotic cells.

Blood vessels

The three main types of blood vessels in the human body are the arteries, veins, and...

The Doppler effect

It is a well-known phenomenon that the sound of an approaching sound source is higher...

Ukrainian Cossack (17th century)

Cossacks, members of independent military communities, played an important role in the...

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