Medieval Venice owed its wealth to its flourishing maritime trade.
The work of smiths – one of the first professions in history – became even more important in the Middle Ages.
The largest land mammal on Earth.
A geisha is a traditional Japanese entertainer whose skills include performing classical music and dance.
This animation presents some interesting facts in social geography.
This animation demonstrates the process of star development for average and massive stars.
Bones of the lower limbs are connected to the trunk by the pelvis.
This animation demonstrates instruments used to examine atmospheric phenomena.
Satellites orbiting the Earth can be used for civilian or military purposes.
The American Civil War was fought between the Confederacy and the Union.
It is a well-known phenomenon that the sound of an approaching sound source is higher than that of a receding one.
The V-1 flying bomb was an early pulse-jet-powered cruise missile developed in Nazi Germany and deployed in WWII.
The Tesla Model S is one of the first commercially available electric cars.
The purpose of the electricity supply network is to provide electricity for consumers.
Edison´s invention records and plays sound from a cylinder, while Berliner´s apparatus uses a disc.
The Space Shuttle was a manned, reusable spacecraft operated by NASA.
Solar power stations convert solar energy into electricity.
Tìm hiểu khái niệm về màu sắc, con số, chữ cái và hình học qua các trò chơi
Emperor Franz Joseph I and the beautiful Elisabeth got married in Vienna in 1854, but their marriage was unfortunately an unhappy one.
Lớp trên cùng của da chúng ta là lớp biểu bì có chứa các tế bào hắc tố.